Merge pull request #11436 from nextcloud/assemblystream-eof-14

[14] AssemblyStream is also eof if we have no more source stream

apps/dav/lib/Upload/AssemblyStream.php

@@ -182,7 +182,7 @@ public function stream_flush() {
 	 * @return bool
 	 */
 	public function stream_eof() {
-		return $this->pos >= $this->size;
+		return $this->pos >= $this->size || $this->currentStream === null;
 	}
 
 	/**