Filter out methods without return type to fix EA-73795

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/JavaClassImpl.java

@@ -101,7 +101,8 @@ public class JavaClassImpl extends JavaClassifierImpl<PsiClass> implements JavaC
         return methods(ArraysKt.filter(getPsi().getMethods(), new Function1<PsiMethod, Boolean>() {
             @Override
             public Boolean invoke(PsiMethod method) {
-                return !method.isConstructor();
+                // Return type seems to be null for example for the 'clone' Groovy method generated by @AutoClone (see EA-73795)
+                return !method.isConstructor() && method.getReturnType() != null;
             }
         }));
     }

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/JavaElementCollectionFromPsiArrayUtil.java

@@ -167,11 +167,6 @@ public class JavaElementCollectionFromPsiArrayUtil {
         });
     }
 
-    @NotNull
-    public static Collection<JavaMethod> methods(@NotNull PsiMethod[] methods) {
-        return convert(methods, Factories.METHODS);
-    }
-
     @NotNull
     public static Collection<JavaMethod> methods(@NotNull Iterable<PsiMethod> methods) {
         return convert(methods, Factories.METHODS);