make dumps core on empty filename

[Manoj Srivastava]

Hi,
            [Please retain the CC to address@hidden so
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          This has been reported by a debian user.

zircon$ make -f ''
make: file.c:57: lookup_file: Assertion *name != '\0'' failed.
Aborted (core dumped)

Clearly passing in an empty string as the filename is an error, but
I think it should be reported to the user in a more friendly manner
than by dumping core with an assertion failure...

In contrast:
zircon$ make -C ''
make: *** : No such file or directory.  Stop.

        manoj
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