                  source = loader.get_source(module_name)
              if source is not None:
                  source = source.splitlines()
          if source is None:
              with suppress(OSError, IOError):
                  with open(filename, 'rb') as fp:
                      source = fp.read().splitlines()
          if source is None:
              return None, [], None, []
  
 
</s> remove             with suppress(ImportError):
 </s> add             try: </s> remove             with suppress(TemplateDoesNotExist):
 </s> add             try: </s> remove         with suppress(OSError):
 </s> add         try:
            try:
                  source = loader.get_source(module_name)
              if source is not None:
                  source = source.splitlines()
          if source is None:
            try:
                  with open(filename, 'rb') as fp:
                      source = fp.read().splitlines()
          if source is None:
              return None, [], None, []
  
keep keep keep keep replace keep keep keep keep keep
 Reverted "Fixed #27818 -- Replaced try/except/pass with contextlib.suppress()."

This reverts commit 550cb3a365dee4edfdd1563224d5304de2a57fda
because try/except performs better. 
django/views/debug.py