Ensure no empty exclude-if-present is added (#2136)

src/vorta/borg/create.py

@@ -171,6 +171,7 @@ def prepare(cls, profile):
                     patterns.append(f[3:].strip())  # Remove the '[x]' prefix
 
             for pattern in patterns:
+                if pattern.strip():
                     cmd.extend(['--exclude-if-present', pattern])
 
         # Add excludes