fix argument error message for true/false #2039
Merged
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Fix the arg message when incorrectly specifying a true/false arg
For instance these two incorrect uses of use_eb_vlr produce confusing messages:
pdal translate my.las --readers.las.use_eb_vlr -o my.bpf
PDAL: Stage option 'readers.las.use_eb_vlr' must be specified as --readers.las.use_eb_vlr=.
pdal translate my.las --readers.las.use_eb_vlr=1 -o my.bpf
PDAL: readers.las: Value '1' provided for argument 'use_eb_vlr' when none is expected.