[notmuch] [PATCH] Error out if no query is supplied to search instead of going into an infinite loop

[Alex Botero-Lowry]

In this case error out when no query is supplied. There seems to be an
infinite-loop casued by i think notmuch_query_search_threads having
an exception:

A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>
A Xapian exception occurred: Syntax: <expression> AND <expression>

I'll look into that bug specifically a bit later.

It might be better to do a usage instead of just throwing an error here?

alex
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