Checking for required elements

[Shad L. Lords]

>>>
>>> Finally in trying to duplicate this I was trying to come up with a
>>> minimal
>>> config and found one that would cause a Segmentation fault during
>>> checking
>>> contacts.
>>
>> I tested this tiny config and it worked okay - got warnings about
>> missing timeperiods and it didn't segfault.  Try the latest CVS when you
>> get a chance to see if that fixes any problems you were having.

Here is a backtrace that I was able to produce.  Hopefully I did it right. 
Also hope it will be of use:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208248640 (LWP 16595)]
0x00a5413b in strlen () from /lib/i686/nosegneg/libc.so.6
(gdb) bt
#0  0x00a5413b in strlen () from /lib/i686/nosegneg/libc.so.6
#1  0x08080fdd in hashfunc (name1=0x20676e69 <Address 0x20676e69 out of 
bounds>, name2=0x0, hashslots=64) at utils.c:3053
#2  0x0808fff2 in find_timeperiod (name=0x20676e69 <Address 0x20676e69 out 
of bounds>) at ../common/objects.c:2891
#3  0x080611b2 in pre_flight_object_check (w=0xbffca108, e=0xbffca104) at 
config.c:2151
#4  0x0806261c in pre_flight_check () at config.c:1466
#5  0x08056a1c in main (argc=Cannot access memory at address 0x1
) at nagios.c:516


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