Jon Trulson 776e031b60 docbook.tcl: fix up some problems using a modern Tcl
One issue that came up was attempting to read array values indexed by
a key that didn't exist when generating indexes and glossaries.

I am not sure why this hasn't been a problem before, but for now, we
simply won't try to emit array values for non-existant array indexes.
2018-09-19 17:40:25 -06:00
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