Catch error on non plaintext files in @file
and reply gracefully in chat
#1106
+50
−0
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Fixes #1044
If the file format (e.g. PDF) cannot be read in plaintext by

file.read()
the error messages appear in chat. This PR emands toe code to make sure the error is trapped and a message is sent to the user in chat explaining that@file
cannot handle context files that are not plaintext.Additional work is needed to handle files that can be converted to plaintext and then used in context. Next step: convert PDF files into plaintext to expand the set of file formats in
@file
.