Fix a crash in sys.version_info check (#59)

pyi.py

@@ -293,7 +293,9 @@ def _check_version_check(
         else:
             if not isinstance(comparator, ast.Tuple):
                 self.error(node, Y003)
-            elif not all(isinstance(elt, ast.Num) for elt in comparator.elts):
+                return
+
+            if not all(isinstance(elt, ast.Num) for elt in comparator.elts):
                 self.error(node, Y003)
             elif len(comparator.elts) > 2:
                 # mypy only supports major and minor version checks

tests/sysversioninfo.pyi

@@ -30,6 +30,9 @@ if sys.version_info[:2] == (2, 7):
 if sys.version_info[:2] == (2,):  # Y005 Version comparison must be against a length-2 tuple
     ...
 
+if sys.version_info[:2] == "lol":  # Y003 Unrecognized sys.version_info check
+    ...
+
 if sys.version_info[:, :] >= (2, 7):  # Y003 Unrecognized sys.version_info check
     ...