VMware: fix return to return a tuple instead of a bool (#45764)

fixes "'bool' object is not iterable" exception when `res` is falsey

lib/ansible/modules/cloud/vmware/vmware_vm_shell.py

@@ -291,7 +291,7 @@ class VMwareShellManager(PyVmomi):
     def process_exists_in_guest(self, vm, pid, creds):
         res = self.pm.ListProcessesInGuest(vm, creds, pids=[pid])
         if not res:
-            return False
+            return False, ''
         res = res[0]
         if res.exitCode is None:
             return True, ''