Improved API error debug info

app/js/lib/mtproto.js

@@ -204,7 +204,7 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
         transformRequest: null
       });
     } catch (e) {
-      requestPromise = $q.reject(e);
+      requestPromise = $q.reject({code: 406, type: 'NETWORK_BAD_RESPONSE', originalError: e});
     }
     return requestPromise.then(
       function (result) {

app/js/lib/mtproto_wrapper.js

@@ -108,7 +108,7 @@ angular.module('izhukov.mtproto.wrapper', ['izhukov.utils', 'izhukov.mtproto'])
 
           if (!options.noErrorBox) {
             error.input = method;
-            error.stack = error.stack || (new Error()).stack;
+            error.stack = error.originalError && error.originalError.stack || error.stack || (new Error()).stack;
             setTimeout(function () {
               if (!error.handled) {
                 ErrorService.show({error: error});