Now only return [] when correct error was caught

thefuck/specific/archlinux.py

@@ -24,8 +24,11 @@ def get_pkgfile(command):
         ).splitlines()
 
         return [package.split()[0] for package in packages]
-    except subprocess.CalledProcessError:
-        return []
+    except subprocess.CalledProcessError as err:
+        if err.returncode == 1 and err.output == "":
+            return []
+        else:
+            raise err
 
 
 def archlinux_env():