修复count不存在的bug

app/Http/Controllers/Api/ExchangeSettingsApiController.php

@@ -24,7 +24,7 @@ class ExchangeSettingsApiController extends Controller
 
         return $this->apiReturn(0, 'ok', [
             'data'  => $data['data'],
-            'count' => $data['count'],
+            'count' => array_get($data,'count',0),
         ]);
     }
 

app/Http/Controllers/Api/IntegralBillsApiController.php

@@ -27,7 +27,7 @@ class IntegralBillsApiController extends Controller
 
         return $this->apiReturn(0, 'ok', [
             'data'  => $data['data'],
-            'count' => $data['count'],
+            'count' => array_get($data,'count',0),
         ]);
     }
 }

app/Http/Controllers/Api/UserExchangesApiController.php

@@ -32,7 +32,7 @@ class UserExchangesApiController extends Controller
 
         return $this->apiReturn(0, 'ok', [
             'data'  => $data['data'],
-            'count' => $data['count'],
+            'count' => array_get($data,'count',0),
         ]);
     }
 
@@ -44,7 +44,7 @@ class UserExchangesApiController extends Controller
 
         return $this->apiReturn(0, 'ok', [
             'data'  => $data['data'],
-            'count' => $data['count'],
+            'count' => array_get($data,'count',0),
         ]);
     }
 

app/Http/Controllers/Api/UserIntegralsApiController.php

@@ -27,7 +27,7 @@ class UserIntegralsApiController extends Controller
 
         return $this->apiReturn(0, 'ok', [
             'data'  => $data['data'],
-            'count' => $data['count'],
+            'count' => array_get($data,'count',0),
         ]);
     }