Improve error message in SBG class parsing (#1401)

Author: tdermendjiev

test-app/build-tools/static-binding-generator/src/main/java/org/nativescript/staticbindinggenerator/generating/parsing/classes/hierarchy/generics/impl/GenericsAwareClassHierarchyParserImpl.java

@@ -317,7 +317,7 @@ private JavaClass getJavaClassFromCache(String className) {
         JavaClass javaClass = classesCache.get(BcelNamingUtil.resolveClassName(className));
 
         if (javaClass == null) {
-            throw new RuntimeException("Class not found!");
+            throw new RuntimeException("Class \"" + className + "\" not found!");
         }
 
         return javaClass;