Fix plugin warning when plugin is unknown but enabled. Closes #330#333

garrytrinder merged 1 commit intomaindev-proxy-tools/toolkit:mainfrom

330-bug-warning-no-plugins-enabled-while-a-plugin-is-enableddev-proxy-tools/toolkit:330-bug-warning-no-plugins-enabled-while-a-plugin-is-enabledCopy head branch name to clipboard