Merge pull request #6883 from ethereum/yul-ast-printer-notypes

yul: AsmPrinter fix when appending type name but no type-name is available

libyul/AsmPrinter.cpp

@@ -266,7 +266,7 @@ string AsmPrinter::formatTypedName(TypedName _variable) const
 
 string AsmPrinter::appendTypeName(YulString _type) const
 {
-	if (m_yul)
+	if (m_yul && !_type.empty())
 		return ":" + _type.str();
 	return "";
 }