do not suggest completions for empty dot target

pkg/analysis_server/test/services/completion/completion_test_util.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.completion.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol
     show Element, ElementKind;
@@ skipping 3480 matching lines @@
       expect(request.replacementOffset, completionOffset - 2);
       expect(request.replacementLength, 8);
       assertSuggestInvocationGetter('length', 'int');
       assertNotSuggested('A');
       assertNotSuggested('a');
       assertNotSuggested('Object');
       assertNotSuggested('==');
     });
   }
 
+  test_PropertyAccess_noTarget() {
+    // SimpleIdentifier  PropertyAccess  ExpressionStatement
+    addSource('/testAB.dart', 'class Foo { }');
+    addTestSource('class C {foo(){.^}}');
+    computeFast();
+    return computeFull((bool result) {
+      assertNoSuggestions();
+    });
+  }
+
+  test_PropertyAccess_noTarget2() {
+    // SimpleIdentifier  PropertyAccess  ExpressionStatement
+    addSource('/testAB.dart', 'class Foo { }');
+    addTestSource('main() {.^}');
+    computeFast();
+    return computeFull((bool result) {
+      assertNoSuggestions();
+    });
+  }
+
   test_PropertyAccess_selector() {
     // SimpleIdentifier  PropertyAccess  ExpressionStatement  Block
     addTestSource('class A {a() {"hello".length.^}}');
     computeFast();
     return computeFull((bool result) {
       expect(request.replacementOffset, completionOffset);
       expect(request.replacementLength, 0);
       assertSuggestInvocationGetter('isEven', 'bool');
       assertNotSuggested('A');
       assertNotSuggested('a');
@@ skipping 226 matching lines @@
       assertNotSuggested('bar2');
       assertNotSuggested('_B');
       assertSuggestLocalClass('Y');
       assertSuggestLocalClass('C');
       assertSuggestLocalVariable('f', null);
       assertNotSuggested('x');
       assertNotSuggested('e');
     });
   }
 }