fixing commands error assertions

Author: fmamud

src/bibleit/command/core.py

@@ -187,6 +187,7 @@ def blb(ctx, *args):
 
 def notes(ctx, *args):
     """List all notes. @alias"""
+    assert not args, "you should use only notes"
     return _format_lines(ctx.notes) if ctx.notes else None
 
 

src/bibleit/command/set.py

@@ -39,6 +39,7 @@ def bible(ctx, *args):
     Examples:
         set bible kjv
         set bible acf, nvi"""
+    assert args, "you should use bible <translation[, translation[, ...]]>"
     translations = [value for arg in args for value in arg.split(",") if value]
     ctx.bible = sorted(
         {_Bible(translation.lower()) for translation in translations},