Catch errors thrown during end event

Fixes #985

Author: kornelski

lib/client.js

@@ -501,16 +501,20 @@ function Request(method, url) {
       return self.callback(err, res);
     }
 
-    if (res.status >= 200 && res.status < 300) {
-      return self.callback(err, res);
-    }
+    try {
+      if (res.status >= 200 && res.status < 300) {
+        return self.callback(err, res);
+      }
 
-    var new_err = new Error(res.statusText || 'Unsuccessful HTTP response');
-    new_err.original = err;
-    new_err.response = res;
-    new_err.status = res.status;
+      var new_err = new Error(res.statusText || 'Unsuccessful HTTP response');
+      new_err.original = err;
+      new_err.response = res;
+      new_err.status = res.status;
 
-    self.callback(new_err, res);
+      self.callback(new_err, res);
+    } catch(e) {
+      self.callback(e); // #985 touching res may cause INVALID_STATE_ERR on old Android
+    }
   });
 }