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Catch MissingSpecError when spring not installed

Ash McKenzie requested to merge ashmckenzie/handle-when-spring-is-not-installed into master

What does this MR do and why?

This change updates bin/spring to gracefully handle if the spring gem is not installed and improves the user experience:

Current

$ bin/spring stop
Traceback (most recent call last):
	3: from bin/spring:14:in `<main>'
	2: from /Users/ash/.asdf/installs/ruby/2.7.7/lib/ruby/site_ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:62:in `gem'
	1: from /Users/ash/.asdf/installs/ruby/2.7.7/lib/ruby/site_ruby/2.7.0/rubygems/dependency.rb:323:in `to_spec'
/Users/ash/.asdf/installs/ruby/2.7.7/lib/ruby/site_ruby/2.7.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'spring' (= 4.1.0) among 1053 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/ash/.asdf/installs/ruby/2.7.7/lib/ruby/gems/2.7.0:/Users/ash/.gem/ruby/2.7.0' , execute `gem env` for more information

With the fix

$ bin/spring stop
INFO: Spring not available.

MR acceptance checklist

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Edited by Ash McKenzie

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