[BUG] mark-save jumps to mark-load on this situation

[superiums]

when i trying to launch mark-save via keybinding, it jumps to mark-load, and report:

mark-load : no-such mark

to reproduce:

1. config like this map mb mark-save
2. use ' to launch mark-load, but type a charactor which was not in the list.
3. it reports not found, this is OK.
4. type mb to execute mark-save, and type any charactor
5. it reports : mark-load: no-such mark again! and mark-save fails.

[joelim-work]

Thanks for reporting, actually what happens is that mark-save succeeds, but doesn't wipe out the old error message.

I have submitted #1544 to address this.