do not throw if runner arguments are undefined

package.json

@@ -102,7 +102,7 @@
         "c9.ide.recentfiles": "#7c099abf40",
         "c9.ide.remote": "#301d2ab519",
         "c9.ide.processlist": "#bc11818bb5",
-        "c9.ide.run": "#1ce4f82ea2",
+        "c9.ide.run": "#3066ebbf0c",
         "c9.ide.run.build": "#4de6a0b9a4",
         "c9.ide.run.debug.xdebug": "#61dcbd0180",
         "c9.ide.save": "#326087f5a2",