west: completion.py: Fix bad indentation and blank lines at end of file

Fixing pylint warnings for a CI check.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
diff --git a/scripts/west_commands/completion.py b/scripts/west_commands/completion.py
index 46dfa4f..687c4b7 100644
--- a/scripts/west_commands/completion.py
+++ b/scripts/west_commands/completion.py
@@ -46,5 +46,4 @@
             with open(cf, 'r') as f:
                 print(f.read())
         except FileNotFoundError as e:
-                log.die('Unable to find completion file: {}'.format(e))
-
+            log.die('Unable to find completion file: {}'.format(e))