Fix TypeError exception for YCM201 and YCM202 rules

Check that the next start position and the previous end position are well
defined before accessing them.

Author: micbou

HISTORY.rst

@@ -2,6 +2,11 @@
 Release history
 ===============
 
+0.2.0 (pending)
+---------------
+
+* Fix TypeError exception for YCM201 and YCM202 rules.
+
 0.1.0 (2018-05-30)
 ------------------
 

flake8_ycm.py

@@ -73,13 +73,15 @@ def SpacesInsideBrackets( logical_line, tokens ):
         yield end, code + message
       if ( next_token_type not in [ tokenize.NL, tokenize.NEWLINE ] and
            next_text != CORRESPONDING_BRACKET[ text ] and
+           next_start and
            next_start[ 0 ] == start[ 0 ] and
            next_start[ 1 ] - start[ 1 ] != 2 ):
         code = 'YCM201'
         message = ' exactly one space required after {}'.format( text )
         yield end, code + message
     if text in RIGHT_BRACKETS:
       if ( prev_text != CORRESPONDING_BRACKET[ text ] and
+           prev_end and
            prev_end[ 0 ] == end[ 0 ] and
            end[ 1 ] - prev_end[ 1 ] != 2 ):
         code = 'YCM202'

tests/spaces_inside_brackets_test.py

@@ -85,3 +85,16 @@ def test( ):
       Error( 2, 14, 'YCM204', 'no spaces between [ and ] for empty content' ),
       Error( 3, 14, 'YCM204', 'no spaces between { and } for empty content' ) ]
   )
+
+
+def InvalidSyntax_test():
+  RunTest(
+    """
+    {
+      'key': 'value' )
+    }
+
+    {
+    """,
+    []
+  )