Verify that callers correctly set parentUsesSize if they use the child's size (and fix a few cases …

sky/sdk/lib/framework/rendering/paragraph.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:sky' as sky;
 import 'box.dart';
 import 'object.dart';
 
 class RenderInline extends RenderObject {
   RenderInline(this.data);
@@ skipping 193 matching lines @@
           TextAlign.right: 'right',
           TextAlign.center: 'center',
         }[style.textAlign];
       }
     }
     _layoutRoot.paint(canvas);
   }
 
   // we should probably expose a way to do precise (inter-glpyh) hit testing
 
-  String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}style:\n${style.toString("$prefix  ")}\n${prefix}text: ${text}\n';
+  String debugDescribeSettings(String prefix) {
+    String result = '${super.debugDescribeSettings(prefix)}';
+    if (style != null)
+      result += '${prefix}style:\n' + style.toString('$prefix  ') + '\n';
+    result += '${prefix}text: ${text}\n';
+    return result;
+  }
 }