Merged in bugfix/PMCORE-876 (pull request #7299)

PMCORE-876 The files are not shown, when we create a PM_Table from an external DB

Approved-by: Julio Cesar Laura Avendaño <contact@julio-laura.com>

workflow/engine/src/ProcessMaker/Core/MultiProcOpen.php

@@ -63,6 +63,9 @@ class MultiProcOpen
         sleep($this->sleepTime); //this sleep is very important
         $i = 0;
         $n = count($processes);
+        if ($n === 0) {
+            return [];
+        }
         $outputs = [];
         do {
             $index = $i % $n;