If "pcap_compile()" fails to compile an empty filter string (because,

for example, the libpcap code generator doesn't support the link-layer
type for the capture), "dfilter_compile()" will succeed but return a
null rfcode pointer.

In that case, instead of telling people that it looks like a valid
display filter (which it does, but it also looks like a complete list of
all the Basque words likely to be known by Hammurabi :-)), and then
crashing when we try to "free" that non-existent dfilter code, we just
report it as a "sorry, couldn't compile that capture filter.


git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@9912 f5534014-38df-0310-8fa8-9805f1628bb7

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