Inconsistent Friendly URL logic

[johnhenley]

Describe the bug

Several sections of the module check whether the friendly url feature is installed when creating URLs. The check should also include determining in the feature is enabled, since the rewriter can be installed yet disabled. In that case, some code (such as email notifications) still executes as if the feature is enabled. To truly disable at, the rewriter needs to be uninstalled.

Software Versions

• DNN: 09.11.01
• Module: 07.00.10

To Reproduce

Steps to reproduce the behavior:

1. In module settings, install rewriter but do not enable it
2. Look at URL in email notifications. It is generated as friendly rather than old style.

Expected behavior

Code should look at enabled rather than--or in addition to--installed.