fixed seqfault that happend when the first operator had no '-'

src/parser.cc

@@ -330,6 +330,10 @@ public:
 
     int numOut = node->numOut;
     if (numOut == -1) numOut = 1;
+    if(numOut >= end - cur_arg){
+
+            throw MissingOutFileException("Missing outfile");
+    }
 
     for (auto it = end - numOut; it != end; it++)
       {