"Fix" the ImageWidget test

spec/unit/imagewidget_spec.lua

@@ -12,7 +12,12 @@ describe("ImageWidget module", function()
         imgw:_render()
         assert(imgw._bb)
     end)
-    it("should error out on none exist image", function()
+    --[[
+    -- NOTE: There was never actually sane error handling in there,
+    --       it would just crash later because of a lack of BB object.
+    --       We now return a checkerboard pattern on image decoding failure,
+    --       which also happens to make the caller's life easier.
+    it("should error out on missing or invalid images", function()
         local imgw = ImageWidget:new{
             file = "wtf.png"
         }
@@ -20,4 +25,5 @@ describe("ImageWidget module", function()
             imgw:_render()
         end)
     end)
+    --]]
 end)