Add What To Do When You Don't Rescue as a ruby til

ruby/what-to-do-when-you-dont-rescue.md

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+# What To Do When You Don't Rescue
+
+Ruby's `rescue` syntax supports a couple different blocks. I was already
+familiar with `ensure` which is a block of code that will be executed
+regardless of whether or not an exception was rescued.
+
+```ruby
+begin
+  do_something_that_could_fail()
+rescue StandardError => e
+  // oh no!
+ensure
+  Logging.info("We attempted to do the thing.")
+end
+```
+
+What if you want to differentiatee between an instance when your code ran
+without incident and when there was an exception? Ruby's `rescue` syntax also
+supports an `else` block. The `else` block is executed only when nothing is
+rescued.
+
+```ruby
+begin
+  do_something_that_could_fail()
+rescue StandardError => e
+  Logging.info("We tried to do something and it failed.")
+else
+  Logging.info("We successfully did the thing!")
+end
+```
+
+There are a lot of ways to use this. Here I was able to differentiate the
+messaging in my logging based on whether or not an exception occurred.
+
+[source](https://blog.bigbinary.com/2017/10/24/ruby-2.5-allows-rescue-inside-do-end-blocks.html)