Issue #18647: Temporary disable the "nothing to repeat" check to make buildbots happy.

Lib/sre_compile.py

@@ -358,8 +358,8 @@ def _optimize_unicode(charset, fixup):
 def _simple(av):
     # check if av is a "simple" operator
     lo, hi = av[2].getwidth()
-    if lo == 0 and hi == MAXREPEAT:
-        raise error("nothing to repeat")
+    #if lo == 0 and hi == MAXREPEAT:
+    #    raise error("nothing to repeat")
     return lo == hi == 1 and av[2][0][0] != SUBPATTERN
 
 def _compile_info(code, pattern, flags):