Set 0 if deprecation rate is null when run assets plugin

- Set deprecation_rate on 0.00 when is null
Merge pull request #80 from kula1922/hotfix/set_0_if_deprecation_rate_is_null_when_run_assets_plugin

Set 0 if deprecation rate is null when run assets plugin
Merge branch 'develop' into feature/get-rid-of-devices-dependency