Improve the display of mat2 when no metadata are found

This should close #74

mat2

@@ -63,7 +63,12 @@ def show_meta(filename: str):
         return
 
     print("[+] Metadata for %s:" % filename)
-    for k, v in p.get_meta().items():
+    meta = p.get_meta().items()
+    if not meta:
+        print("  No metadata found")
+        return
+
+    for k, v in meta:
         try:  # FIXME this is ugly.
             print("  %s: %s" % (k, v))
         except UnicodeEncodeError:

tests/test_climat2.py

@@ -81,6 +81,7 @@ class TestCleanFolder(unittest.TestCase):
                 stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
         self.assertNotIn(b'Comment: Created with GIMP', stdout)
+        self.assertIn(b'No metadata found', stdout)
 
         shutil.rmtree('./tests/data/folder/')