[bug #50010] Index error message "error: a(5): out of bound 1", et al. have bracket type match

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Follow-up Comment #7, bug #50010 (group octave):

I still the idea of giving a clue to the programmer about the type of the
variable.  Slightly different example,

str = ""
str = 


This makes it very hard to tell that *str* is empty, and of type char_matrix.

@jwe did have a patch for this once upon a time.  I just tried the *diff* file
from 2017, and, unsurprisingly, it does not apply correctly.

As long as this code is outside of a high performance block then I think it is
okay to introduce some overhead to figure out what the indexing character
was.

In jwe's implementation it was using try/catch blocks which should be very
fast in C++.




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