Remove workaround for empty lines in dynamic_prompt #884
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This guard clause looks like a workaround of Reline's bug. I think this bug is already fixed or perhaps never existed.
Also, modifying given value (might be Reline's internal value) is not good. Fortunately, this code is never executed.
Reline calls prompt proc with
check_multiline_prompt(whole_buffer)
orcheck_multiline_prompt(@buffer_of_lines)
@buffer_of_lines
is always non-empty because Reline would crash when it becomes empty.