On demand macros with empty host name not working since 3.0b7

[Matthias Eble]

Hi list,

when testing around with nagios 3.0 I recognized that support for empty 
host names in on demand macros was broken somewhere between b6 and b7.

The problem is located in common/macros.c line 842:
/* if first arg is blank, it means use the current host name */
if(arg1==NULL){

But arg1 isn't a null pointer in this case. Changing the line to
if(*arg1=='\x0'){

brings back expected behaviour.
It'd be great to see this fixed in next rc/stable

Matthias


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