Small opts

indra/llui/llfloaterreg.h

@@ -101,7 +101,7 @@ class LLFloaterReg
 	}
 	
 	static void add(const std::string& name, const std::string& file, const LLFloaterBuildFunc& func,
-					const std::string& groupname = LLStringUtil::null);
+					const std::string& groupname = std::string());
 
 	// Helpers
 	static LLFloater* getLastFloaterInGroup(std::string_view name);

indra/llui/llkeywords.cpp

@@ -164,7 +164,7 @@ std::string LLKeywords::getArguments(LLSD& arguments)
 std::string LLKeywords::getAttribute(const std::string& key)
 {
 	attribute_iterator_t it = mAttributes.find(key);
-	return (it != mAttributes.end()) ? it->second : "";
+	return (it != mAttributes.end()) ? it->second : std::string();
 }
 
 LLColor4 LLKeywords::getColorGroup(const std::string& key_in)