fix(spawnify) do not emit close and exit when could not create child

Author: coderaiser

lib/spawnify.js

@@ -223,6 +223,9 @@
 
         child.on('error', function(error) {
             self._emit('error', newLine(error));
+            child = null;
+            self._emit('exit');
+            self._emit('close');
         });
 
         child.on('exit', function() {