SIGSEGV in check.c on Solaris when plugin output is empty

[thuebler at sachsendv.de]

Hi list,

nagios dumps core with SIGSEV on Solaris 10 when a plugin does not print 
any output.
Using gdb I found it happening in line 803 of base/checks.c, where 
checkresult_dbuf.buf is 0x0 on empty plugin output.

Versions:
- nagios-3.0.3 and nagios-cvs (as of 24. Sept 2008)
- Solaris 10 x86
- both Sun Studio 11 and gcc

I tried a fix just in place by inserting a NULL pointer check just before 
the fprintf in line 803 ... maybe there is a more elegant solution.
 
On linux, glibc seems to handel this problem in printf("output=%s", NULL) 
by returning the string "(null)".


Regards,
Torsten
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