Remove always true test in Copyright._get_licenses()

If the License is not present in a paragraph, a
MachineReadableFormatError is raise on parsing and License always has a
synopsis.

debexpo/tools/debian/copyright.py

@@ -78,9 +78,8 @@ class Copyright():
             return licenses
 
         for paragraph in self.copyright.all_files_paragraphs():
-            if paragraph.license and paragraph.license.synopsis:
-                if not paragraph.files == ('debian/*',):
-                    licenses.update([paragraph.license.synopsis])
+            if not paragraph.files == ('debian/*',):
+                licenses.update([paragraph.license.synopsis])
 
         return licenses