Merge pull request #19010 from CyberAndrii/18957-fix-error-on-empty-response-headers

Fix error on empty response headers

src/display/network.js

@@ -273,15 +273,17 @@ class PDFNetworkStreamFullRequestReader {
     const fullRequestXhrId = this._fullRequestId;
     const fullRequestXhr = this._manager.getRequestXhr(fullRequestXhrId);
 
+    const rawResponseHeaders = fullRequestXhr.getAllResponseHeaders();
     const responseHeaders = new Headers(
-      fullRequestXhr
-        .getAllResponseHeaders()
+      rawResponseHeaders
+        ? rawResponseHeaders
             .trim()
             .split(/[\r\n]+/)
             .map(x => {
               const [key, ...val] = x.split(": ");
               return [key, val.join(": ")];
             })
+        : []
     );
 
     const { allowRangeRequests, suggestedLength } =