Strip filename descriptions before checking

When checking for uncommon file extensions in the filename field
we should strip descriptions that are meant for SAF Bundler, for
example: Annual_Report_2020.pdf__description:Report. This ends up
as a false positive that spams the output with warnings.

CHANGELOG.md

@@ -15,6 +15,8 @@ because it is deprecated and outdated
 - Don't run `fix.separators()` on title or abstract fields
 - Don't run whitespace or newline fixes on abstract fields
 - Ignore some common non-SPDX licenses
+- Ignore `__description` suffix in filenames meant for SAFBuilder when checking
+for uncommon file extensions
 
 ### Updated
 - Python dependencies

csv_metadata_quality/check.py

@@ -286,6 +286,11 @@ def filename_extension(field):
 
     # Iterate over all values
     for value in values:
+        # Strip filename descriptions that are meant for SAF Bundler, for
+        # example: Annual_Report_2020.pdf__description:Report
+        if "__description" in value:
+            value = value.split("__")[0]
+
         # Assume filename extension does not match
         filename_extension_match = False