Fix ConnectionErrorProof response count on single node read errors

on a read error, executeSingleNode() computed the number of missing responses from the already dequeued command queue, so it returned too few elements or threw a ValueError from array_fill(). the failed command and all remaining ones now get the connection exception, matching executeCluster().

src/Pipeline/ConnectionErrorProof.php

@@ -73,7 +73,7 @@ class ConnectionErrorProof extends Pipeline
             try {
                 $responses[$i] = $connection->readResponse($command);
             } catch (CommunicationException $exception) {
-                $add = count($commands) - count($responses);
+                $add = $sizeOfPipe - count($responses);
                 $responses = array_merge($responses, array_fill(0, $add, $exception));
 
                 break;