Merge pull request #867 from EBISPOT/fix-stato-issue

Fix failing class expression

Author: haideriqbal

frontend/src/app/util.ts

@@ -7,7 +7,7 @@ import Property from "../model/Property";
 export function asArray<T>(obj: T | T[]): T[] {
   if (Array.isArray(obj)) {
     return obj;
-  } else if (obj) {
+  } else if (obj !== undefined && obj !== null) {
     return [obj];
   }
   return [];

frontend/src/components/ClassExpression.tsx

@@ -303,7 +303,10 @@ export default function ClassExpression({
     );
   }
 
-  const hasValue = asArray(expr["http://www.w3.org/2002/07/owl#hasValue"])[0];
+  let hasValue = asArray(expr["http://www.w3.org/2002/07/owl#hasValue"])[0];
+  if (typeof hasValue === "number") {
+      hasValue = hasValue.toString();
+  }
   if (hasValue) {
     return (
       <span>