catdoc doesn't error if you give it a directory to convert

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Steps to Reproduce

You're supposed to give catdoc an MS-Word 1997-2004 .doc file to process. If instead you specify a directory, it will not error. For example,

catdoc /usr

Catdoc version 0.95 as packaged in most Linux distributions will print nothing or may crash. My fork will either print nothing, or with the -b ("process broken MS-Word file") option it will print a lot of "Warning: paragraph buffer overflow, discarding paragraph"

Expected result

Even with -b option, catdoc should probably exit with a "not a file" error.

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catppt /usr and xls2csv /usr print "/usr is not OLE file or Error" (with no error status). They should all be consistent.