Quality Gate with 0 conditions should not be used by a project

It's possible to create a QG with 0 conditions and then assign it to a project. This should not be possible.

Solution:

• Upon Quality Gate creation, it should not be available to assign it to any project until it has at least one condition.
• The "Set as default" button should be disabled, and the project assignment widget at the bottom shouldn't appear.
• With the message(TBD) " no conditions, please add conditions before you can set it as default or assign it to your projects."