Feature/64 activity search

search box clean up done. good to go.
1. Wrapping the entire method's logic in an `if` or `unless` statement means that you will send back `nil`if that  condition is not satisfied, hence no `else` is needed
2. Also, you should avoid using `else` with `unless`. unless/else is more confusing/difficult to understand compared to an if/else. In this case you will be getting rid of the `else` anyway but thought I'd point it out.