Fix api call

dmnverifierfrontend/src/main/resources/META-INF/resources/js/dmnVerifier.js

@@ -142,10 +142,11 @@ function getVerifications() {
       apiPath += '?';
     } else {
       apiPath += "/types";
+      apiPath += '?';
       for (let i = 0; i < $verifierTypes[0].selectedOptions.length; i++) {
-        apiPath += '&typeName=' + $verifierTypes[0].selectedOptions[i].value;
+        apiPath += 'typeName=' + $verifierTypes[0].selectedOptions[i].value
+            + '&';
       }
-      apiPath += '&';
     }
     apiPath += 'token=' + getMetricToken();