Fixed 'Implement members implement functions with no curly braces - not convenient'

#KT-1317 fixed

idea/src/org/jetbrains/jet/plugin/codeInsight/OverrideImplementMethodsHandler.java

@@ -128,13 +128,7 @@ public abstract class OverrideImplementMethodsHandler implements LanguageCodeIns
             ImportClassHelper.addImportDirectiveIfNeeded(returnType, file);
         }
 
-        final String initializer = defaultInitializer(returnType, stdlib);
+        bodyBuilder.append("{").append("throw UnsupportedOperationException()").append("}");
-        if (initializer != null) {
-            bodyBuilder.append(" = ").append(initializer);
-        }
-        else {
-            bodyBuilder.append("{").append("throw UnsupportedOperationException()").append("}");
-        }
 
         return JetPsiFactory.createFunction(project, bodyBuilder.toString());
     }

idea/testData/codeInsight/overrideImplement/generateMulti.kt.after

@@ -14,5 +14,7 @@ class SomeOther<S> : Some<S> {
     override fun someGenericFoo(): S {
         throw UnsupportedOperationException()
     }
-    override fun someOtherFoo(): Int = 0
+    override fun someOtherFoo(): Int {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/genericMethod.kt.after

@@ -4,5 +4,7 @@ trait G<T> {
 
 class GC() : G<Int> {
 
-    override fun foo(t: Int): Int = 0
+    override fun foo(t: Int): Int {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/javaInterfaceMethod/foo/Impl.kt.after

@@ -2,5 +2,7 @@ import foo.Intf
 
 class Impl(): Intf {
 
-    override fun getFooBar(): String? = null
+    override fun getFooBar(): String? {
+        throw UnsupportedOperationException()
+    }
 }

idea/testData/codeInsight/overrideImplement/traitNullableFunction.kt.after

@@ -4,5 +4,7 @@ trait Some {
 
 class SomeOther : Some {
 
-    override fun foo(some: Int?): Int = 0
+    override fun foo(some: Int?): Int {
+        throw UnsupportedOperationException()
+    }
 }