Ensure value is quoted properly

This fix ensures every read registry data is quoted.
If the data does not exist it resolves into an empty string with quote.
This fix override the previous attempt with commit ce59693135ab0fccbcd3d0ed546d0097f36f0a3c

https://bugzilla.redhat.com/show_bug.cgi?id=1155284
Merge pull request #967 from bzwei/expression_with_quote

Ensure value is quoted properly