Fixed bug EXT-5415 (Edit floater and object profile show group as "loading..." when set to "none").

Made LLCacheName getGroupName() and getName() methods return TRUE if the given group/avatar name is NULL, so that LLNameBox doesn't display "Loading..." indefinitely.
There's nothing to wait for in case of NULL id: the name cache returns a predefined name that won't change (i.e. it's the final result).

Reviewed by Mike: https://codereview.productengine.com/secondlife/r/223/

--HG--
branch : product-engine

indra/llmessage/llcachename.cpp

@@ -486,7 +486,7 @@ BOOL LLCacheName::getName(const LLUUID& id, std::string& first, std::string& las
 	{
 		first = sCacheName["nobody"];
 		last.clear();
-		return FALSE;
+		return TRUE;
 	}
 
 	LLCacheNameEntry* entry = get_ptr_in_map(impl.mCache, id );
@@ -530,7 +530,7 @@ BOOL LLCacheName::getGroupName(const LLUUID& id, std::string& group)
 	if(id.isNull())
 	{
 		group = sCacheName["none"];
-		return FALSE;
+		return TRUE;
 	}
 
 	LLCacheNameEntry* entry = get_ptr_in_map(impl.mCache,id);