Fix syntax issues / unused import reported by static code analysis

pmb/helpers/repo.py

@@ -63,6 +63,4 @@ def diff(args, files_a, files_b=None):
             if add:
                 ret.append(arch + "/" + file)
 
-
-
     return sorted(ret)

test/repo.py

@@ -20,7 +20,6 @@ import os
 import sys
 import pytest
 import types
-import pathlib
 import time
 
 # Import from parent directory
@@ -35,6 +34,7 @@ def args(request, tmpdir):
     args.work = str(tmpdir)
     return args
 
+
 def clear_timestamps_from_files(files):
     """
     Replace all last modified timestamps from pmb.helpers.repo.files() with
@@ -54,7 +54,7 @@ def test_files_not_empty(args):
     pkgs = args.work + "/packages"
     for dir in ["", "armhf", "x86_64"]:
         os.mkdir(pkgs + "/" + dir)
-    open(pkgs+"/x86_64/test", "a").close()
+    open(pkgs + "/x86_64/test", "a").close()
     files = pmb.helpers.repo.files(args)
     clear_timestamps_from_files(files)
     assert files == {"armhf": {}, "x86_64": {"test": None}}