tool_getparam: handle non-existing (out of range) short-options

... correctly, even when they follow an existing one without a space in
between.

Verify with test 467

Fo

tool_getparam: handle non-existing (out of range) short-options

... correctly, even when they follow an existing one without a space in
between.

Verify with test 467

Follow-up to 07dd60c05b
Reported-by: Geeknik Labs
Fixes #13101
Closes #13102

show more ...