Remove unused import and clean control flow

flask/wrappers.py

@@ -13,7 +13,7 @@ from werkzeug.wrappers import Request as RequestBase, Response as ResponseBase
 from werkzeug.exceptions import BadRequest
 
 from . import json
-from .globals import _request_ctx_stack, current_app
+from .globals import _request_ctx_stack
 
 _missing = object()
 
@@ -175,8 +175,7 @@ class Request(RequestBase):
         .. versionadded:: 0.8
         """
         ctx = _request_ctx_stack.top
-        if ctx is not None:
+        if ctx is not None and ctx.app.config.get('DEBUG', False):
-            if ctx.app.config.get('DEBUG', False):
             raise BadRequest('Failed to decode JSON object: {0}'.format(e))
         raise BadRequest()