Ensure that "RPM archives" exists in the package description, regardless of...

Ensure that "RPM archives" exists in the package description, regardless of whether python3-rpm is installed or not.

diffoscope/comparators/rpm_fallback.py

@@ -27,6 +27,8 @@ class AbstractRpmFile(File):
 
 
 class RpmFile(AbstractRpmFile):
+    DESCRIPTION = "RPM archives"
+
     def compare(self, other, source=None):
         difference = self.compare_bytes(other)
         if not difference:

[Chris Lamb]

@mattia Fixes the non-determistic output of _data/diffoscope.yml.

[Mattia Rizzolo]

Great, thanks!