Ignore before_render_template return values

flask/templating.py

@@ -101,20 +101,9 @@ class DispatchingJinjaLoader(BaseLoader):
 
 
 def _render(template, context, app):
-    """Renders the template and fires signals.
+    """Renders the template and fires the signal"""
-
-    It is possible to override render template in the before_render_template signal.
-    It can be done only if exactly one receiver and it return not None result."""
-
-    brt_resp = before_render_template.send(app, template=template, context=context)
-    
-    overrides = [rv for _, rv in brt_resp if rv is not None]
-    if len(overrides) == 1:
-        return overrides[0]
-    elif len(overrides) > 1:
-        raise RuntimeError('More than one before_render_template signal '
-                           'returned data')
 
+    before_render_template.send(app, template=template, context=context)
     rv = template.render(context)
     template_rendered.send(app, template=template, context=context)
     return rv

tests/test_signals.py

@@ -70,26 +70,6 @@ def test_before_render_template():
     finally:
         flask.before_render_template.disconnect(record, app)
 
-def test_before_render_template_signal_not_None_result_render_skip_render_template():
-    app = flask.Flask(__name__)
-
-    @app.route('/')
-    def index():
-        return flask.render_template('simple_template.html', whiskey=42)
-
-    recorded = []
-
-    def record(sender, template, context):
-        recorded.append((template, context))
-        return 'Not template string'
-
-    flask.before_render_template.connect(record, app)
-    try:
-        rv = app.test_client().get('/')
-        assert rv.data == b'Not template string'
-    finally:
-       flask.before_render_template.disconnect(record, app) 
-
 def test_request_signals():
     app = flask.Flask(__name__)
     calls = []