Minor change the the parse_headers function

lib/stomp.js

@@ -50,8 +50,16 @@ function parse_headers(raw_headers) {
             var header_val = header.join(':').trim();
             headers[header_key] = header_val;
             continue;
-        }
-        headers[header[0].trim()] = header[1].trim();
+        } else {
+	/**
+	 * This was causing errors for me,
+	 * unsure as to why it is placed here
+	 * in the code anyway, as we have already
+	 * tested the length of the array
+	 * above.
+	*/
+	     headers[header[0].trim()] = null;
+	}
     }
     return headers;
 };