Update Calculator.java

src/main/java/no/uib/inf101/calculator/Calculator.java

@@ -33,7 +33,8 @@ public class Calculator {
      */
     public String getOperatorDescription(String operatorSymbol) {
         // TODO
-        throw new NullPointerException("This operator is not supported by the calculator: " + operatorSymbol);
+        return "";
+        //throw new NullPointerException("This operator is not supported by the calculator: " + operatorSymbol);
     }
 
     /**