fix bug in WebM resetting

src/Images/ImageExpand.coffee

@@ -158,7 +158,7 @@ ImageExpand =
       TrashQueue.remove el
       unless file.isHovered
         $.queueTask(-> el.src = el.src) if /\.gif$/.test el.src
-        el.currentTime = 0 if isVideo
+        el.currentTime = 0 if isVideo and el.readyState >= el.HAVE_METADATA
     else
       el.src = src or file.URL
       $.after thumb, el

src/Images/ImageHover.coffee

@@ -18,7 +18,7 @@ ImageHover =
       el.id = 'ihover'
       TrashQueue.remove el
       $.queueTask(-> el.src = el.src) if /\.gif$/.test el.src
-      el.currentTime = 0 if isVideo
+      el.currentTime = 0 if isVideo and el.readyState >= el.HAVE_METADATA
     else
       file.fullImage = el = $.el (if isVideo then 'video' else 'img'),
         className: 'full-image'