[feat](tester.py & common.py)支持非json响应时的字符串截取设置全局变量

backend/utils/common.py

@@ -198,9 +198,7 @@ def dict_get(dic, locators, default=None):
     '''
 
     if not isinstance(dic, dict):
-        if not isinstance(locators, list):
-            return default
-        elif isinstance(dic, str) and len(locators) == 1 and is_slice_expression(locators[0]):
+        if isinstance(dic, str) and len(locators) == 1 and is_slice_expression(locators[0]):
             slice_indexes = locators[0].split(':')
             start_index = int(slice_indexes[0]) if slice_indexes[0] else None
             end_index = int(slice_indexes[-1]) if slice_indexes[-1] else None