checks: Replace bare except (Flake8 E722) in po stats script (#4354)

This addresses the PEP8 style error of mentioning specific exceptions (Flake8 E722) by specifying the exception type in the except clause within the writejson function in grass_po_stats.py. Now, bare except is replaced by OSError to catch only OS-related exceptions because os.remove() can raise various OS-related exceptions such as FileNotFoundError or PermissionError.

Additionally, it confirms that no other common Flake8 errors (E122, E128, E231, E401) are present in the file by removing the other ignores.

.flake8

@@ -24,7 +24,6 @@ per-file-ignores =
     imagery/i.atcorr/create_iwave.py: F632, F821, W293
     doc/python/m.distance.py: E501
     doc/gui/wxpython/example/dialogs.py: F401
-    locale/grass_po_stats.py: E122, E128, E231, E401, E722
     gui/scripts/d.wms.py: E501
     gui/wxpython/core/gconsole.py: E722
     gui/wxpython/core/render.py: E722

locale/grass_po_stats.py

@@ -144,7 +144,7 @@ def writejson(stats, outfile):
     fout.close()
     try:
         os.remove("messages.mo")
-    except:
+    except OSError:
         pass