Fix errors in verifier, when there are no input columns

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/IdenticalRuleVerifier.java

@@ -33,8 +33,10 @@ public class IdenticalRuleVerifier extends AbstractVerifier {
   }
 
   private void checkDecisionTable(VDmnDecisionTable dmnDecisionTable) {
-    checkForIdenticalRules(
-        dmnDecisionTable, dmnDecisionTable.getInputColumns(), 0, dmnDecisionTable.getRules());
+    if (dmnDecisionTable.getInputColumns().size() > 0) {
+      checkForIdenticalRules(
+          dmnDecisionTable, dmnDecisionTable.getInputColumns(), 0, dmnDecisionTable.getRules());
+    }
   }
 
   protected void checkForIdenticalRules(
@@ -44,14 +46,11 @@ public class IdenticalRuleVerifier extends AbstractVerifier {
       List<VDmnRule> currentRules) {
     if (i == inputs.size()) {
       currentRules.forEach(
-          rule ->
-              vreFactory.addElement(
-                  VerificationResultEntryElement.create(rule)));
+          rule -> vreFactory.addElement(VerificationResultEntryElement.create(rule)));
       vreFactory.addVerificationFix(SHOW_RULES);
       vreFactory.addToEntry(
           VerificationClassification.WARNING,
-          templateDecision(dmnDecisionTable.getDmnDecision())
-              + "Rules %s have identical inputs.",
+          templateDecision(dmnDecisionTable.getDmnDecision()) + "Rules %s have identical inputs.",
           getRulesRowsStrings(currentRules));
     } else {
       List<VDmnInputValue> curInVals = new ArrayList<>();

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/MissingRuleVerifier.java

@@ -50,34 +50,36 @@ public class MissingRuleVerifier extends AbstractVerifier {
 
   private void findMissingRules(VDmnDecisionTable dmnDecisionTable) {
     List<VDmnInputColumn> inputs = dmnDecisionTable.getInputColumns();
-    List<VDmnRuleChangeableImpl> missingRules =
-        checkForMissingRules(inputs, dmnDecisionTable.getRules());
-    // add errors for missing intervals
-    for (VDmnRule missingRule : missingRules) {
-      StringBuilder sb = new StringBuilder();
-      sb.append(templateDecision(dmnDecisionTable.getDmnDecision()));
-      sb.append("The following rule is not defined: { ");
-      sb.append(
-          missingRule.getDmnInputValues().stream()
-              .map(v -> v.getBoundary().getParsedText())
-              .map(s -> s.isEmpty() ? "-" : s)
-              .collect(Collectors.joining(" / ")));
-      sb.append(" }");
-      Action.Builder fixActionBuilder =
-          Action.getBuilder().withActionScope(ActionScope.RULE).withActionType(ActionType.CREATE);
-      for (VDmnInputValue v : missingRule.getDmnInputValues()) {
-        fixActionBuilder.addValue(
-            v.getDmnInputColumn().getInputId().getValue(), v.getBoundary().getParsedText());
+    if (inputs.size() > 0) {
+      List<VDmnRuleChangeableImpl> missingRules =
+          checkForMissingRules(inputs, dmnDecisionTable.getRules());
+      // add errors for missing intervals
+      for (VDmnRule missingRule : missingRules) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(templateDecision(dmnDecisionTable.getDmnDecision()));
+        sb.append("The following rule is not defined: { ");
+        sb.append(
+            missingRule.getDmnInputValues().stream()
+                .map(v -> v.getBoundary().getParsedText())
+                .map(s -> s.isEmpty() ? "-" : s)
+                .collect(Collectors.joining(" / ")));
+        sb.append(" }");
+        Action.Builder fixActionBuilder =
+            Action.getBuilder().withActionScope(ActionScope.RULE).withActionType(ActionType.CREATE);
+        for (VDmnInputValue v : missingRule.getDmnInputValues()) {
+          fixActionBuilder.addValue(
+              v.getDmnInputColumn().getInputId().getValue(), v.getBoundary().getParsedText());
+        }
+        vreFactory
+            .addVerificationFix(VerificationFix.SHOW_DECISION)
+            .addVerificationFix(
+                VerificationFix.getBuilder()
+                    .withFixName(FIX_NAME)
+                    .addAction(fixActionBuilder.build())
+                    .build())
+            .addElement(VerificationResultEntryElement.create(dmnDecisionTable))
+            .addToEntry(VerificationClassification.WARNING, sb.toString());
       }
-      vreFactory
-          .addVerificationFix(VerificationFix.SHOW_DECISION)
-          .addVerificationFix(
-              VerificationFix.getBuilder()
-                  .withFixName(FIX_NAME)
-                  .addAction(fixActionBuilder.build())
-                  .build())
-          .addElement(VerificationResultEntryElement.create(dmnDecisionTable))
-          .addToEntry(VerificationClassification.WARNING, sb.toString());
     }
   }