fixed #146

filter out empty costumes

gui.js

@@ -68,7 +68,7 @@ sb, CommentMorph, CommandBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2013-September-18';
+modules.gui = '2013-September-19';
 
 // Declarations
 
@@ -4889,7 +4889,7 @@ SpriteIconMorph.prototype.step = function () {
 // SpriteIconMorph layout
 
 SpriteIconMorph.prototype.fixLayout = function () {
-    if (!this.thumbnail) {return null; }
+    if (!this.thumbnail || !this.label) {return null; }
 
     this.setWidth(
         this.thumbnail.width()

history.txt

@@ -1920,3 +1920,4 @@ ______
 
 130919
 * Objects: fixed #169 (sprites are sometimes off-placed when the project is loaded)
+* Objects, GUI: fixed #146 (filter out empty costumes)

objects.js

@@ -5239,6 +5239,7 @@ Costume.prototype.thumbnail = function (extentPoint) {
         trg = newCanvas(extentPoint),
         ctx = trg.getContext('2d');
 
+    if (!src || src.width + src.height === 0) {return trg; }
     ctx.scale(scale, scale);
     ctx.drawImage(
         src,