Merge pull request #11947 from Snuffleupagus/GlobalImageCache-assert-not-inline

Ensure that that we don't attempt to cache *inline* images in the `GlobalImageCache` (PR 11912 follow-up)

Author: timvandermeij

src/core/evaluator.js

@@ -605,6 +605,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
         });
 
         if (imageRef) {
+          assert(!isInline, "Cannot cache an inline image globally.");
           this.globalImageCache.addPageIndex(imageRef, this.pageIndex);
 
           if (cacheGlobally) {