Jinja2Bear: Disable the need of trailing comment

This enables the end of block to not have comment.
However by default it would check for the trailing comment
But the behavior can be changed by the user explicitly.

Closes coala#2659

bears/jinja2/Jinja2Bear.py

@@ -267,7 +267,8 @@ def check_control_end_tags(self,
                                filename,
                                line,
                                line_number,
-                               control_spacing):
+                               control_spacing,
+                               check_end_labels):
         """
         Checks any control end tag in the given line for spacing issues,
         missing/wrong labels or missing corresponding opening tag.
@@ -308,6 +309,9 @@ def check_control_end_tags(self,
                 yield self.handle_control_spacing_issue(
                     file, filename, line, line_number, control_spacing, m)
 
+            if not check_end_labels:
+                return
+
             # yield results for incorrect or missing end labels
             if label is None and line_number != start_in_line:
                 diff = generate_label_diff(
@@ -356,6 +360,7 @@ def run(self,
             variable_spacing: int = 1,
             statement_spacing: int = 1,
             control_spacing: int = 1,
+            check_end_labels: bool = True,
             ):
         """
         Check `Jinja2 templates <http://jinja.pocoo.org>`_ for syntax,
@@ -420,7 +425,9 @@ def run(self,
                 file, filename, line, line_number, control_spacing)
 
             yield from self.check_control_end_tags(
-                file, filename, line, line_number, control_spacing)
+                file, filename, line, line_number, control_spacing,
+                check_end_labels,
+            )
 
         # We've reached the end of the file.
         # Check if all control blocks have been closed

tests/jinja2/Jinja2BearTest.py

@@ -164,6 +164,26 @@ def test_control_spacing(self):
     valid_files=(good_file1, good_file2, good_file3),
     invalid_files=(bad_file1, bad_file2))
 
+valid_file_without_end_comments = """
+foo
+{% for x in something %}
+render stuff
+{% endfor %}
+"""
+
+valid_file_with_end_comments = """
+foo
+{% for x in something %}
+render stuff
+{% endfor %}{# for x in something #}
+"""
+
+Jinja2BearForLoopLabelDisableTest = verify_local_bear(
+    Jinja2Bear,
+    valid_files=(valid_file_without_end_comments, valid_file_with_end_comments),
+    invalid_files=(),
+    settings={'check_end_labels': 'False'})
+
 
 class Jinja2BearLabelDiffTest(unittest.TestCase):