Stop re-throwing errors in the 'GetOperatorList' and 'GetTextContent' handlers, in src/core/worker.js

These functions aren't returning anything, now that they're using `ReadableStream`s, and it thus doesn't seem necessary to re-throw errors (also given the console message that's caused by it).

src/core/worker.js

@@ -501,7 +501,9 @@ var WorkerMessageHandler = {
                        { featureId: UNSUPPORTED_FEATURES.unknown, });
 
           sink.error(reason);
-          throw reason;
+
+          // TODO: Should `reason` be re-thrown here (currently that casues
+          //       "Uncaught exception: ..." messages in the console)?
         });
       });
     }, this);
@@ -538,7 +540,9 @@ var WorkerMessageHandler = {
             return; // ignoring errors from the terminated thread
           }
           sink.error(reason);
-          throw reason;
+
+          // TODO: Should `reason` be re-thrown here (currently that casues
+          //       "Uncaught exception: ..." messages in the console)?
         });
       });
     });

test/unit/api_spec.js

@@ -1281,11 +1281,6 @@ describe('api', function() {
 
     it('gets operatorList, from corrupt PDF file (issue 8702), ' +
        'with/without `stopAtErrors` set', function(done) {
-      if (isNodeJS()) {
-        pending(
-          'Fails with "Unhandled promise rejection: ..." errors in Node.js.');
-      }
-
       const loadingTask1 = getDocument(buildGetDocumentParams('issue8702.pdf', {
         stopAtErrors: false, // The default value.
       }));