Merge pull request #2266 from fsih/warnMsg

Give some indication of why asset load failed

src/import/load-costume.js

@@ -171,7 +171,8 @@ const fetchBitmapCanvas_ = function (costume, runtime, rotationCenter) {
                 assetMatchesBase: scale === 1 && !textImageElement
             };
         })
-        .catch(() => {
+        .catch(error => {
+            log.warn(`${error.name}: ${error.message}`);
             // Clean up the text layer properties if it fails to load
             delete costume.textLayerMD5;
             delete costume.textLayerAsset;