Add CTable::empty

It shouldn't make any real difference (especially not for std::vector), but
"empty()" is better than using "size() == 0".

Signed-off-by: Uli Schlachter <psychon@znc.in>

Utils.cpp

@@ -390,7 +390,7 @@ bool CTable::SetCell(const CString& sColumn, const CString& sValue, unsigned int
 bool CTable::GetLine(unsigned int uIdx, CString& sLine) const {
 	stringstream ssRet;
 
-	if (!size()) {
+	if (empty()) {
 		return false;
 	}