fix missing parameter

Author: peecky

lib/forever.js

@@ -255,7 +255,13 @@ function stopByPid(event, format, pid) {
     });
   }
 
-  getAllProcesses(function (processes) {
+  getAllProcesses(function (err, processes) {
+    if (err) {
+      return process.nextTick(function () {
+        emitter.emit('error', err);
+      });
+    }
+
     var procs = processes;
 
     // if we specified pid -> send action only to this process