Use "with suppress()" to suppress python exceptions

Using
```Python
with suppress(OSError):
    os.remove('somefile.tmp')
```
instead of
```Python
try:
    os.remove('somefile.tmp')
except OSError:
    pass
```
makes the code more compact and more readable IMO.

This pattern was recommended by Raymond Hettinger, a Python Core
Developer in his talk "Transforming Code into Beautiful, Idiomatic Python" at https://www.youtube.com/watch?v=OSGv2VnC0go. The transcript is available at https://github.com/JeffPaine/beautiful_idiomatic_python

kittens/diff/collect.py

@@ -7,6 +7,7 @@ import re
 from functools import lru_cache
 from hashlib import md5
 from mimetypes import guess_type
+from contextlib import suppress
 
 path_name_map = {}
 
@@ -140,10 +141,8 @@ def is_image(path):
 def data_for_path(path):
     ans = raw_data_for_path(path)
     if not is_image(path) and not os.path.samefile(path, os.devnull):
-        try:
+        with suppress(UnicodeDecodeError):
             ans = ans.decode('utf-8')
-        except UnicodeDecodeError:
-            pass
     return ans