Fix Indexing Gemspec Awareness Bug (#1060)

Author: jacobdaddario

lib/ruby_indexer/lib/ruby_indexer/configuration.rb

@@ -179,7 +179,12 @@ def initial_excluded_gems
 
       # When working on a gem, we need to make sure that its gemspec dependencies can't be excluded. This is necessary
       # because Bundler doesn't assign groups to gemspec dependencies
-      this_gem = Bundler.definition.dependencies.find { |d| d.to_spec.full_gem_path == Dir.pwd }
+      this_gem = Bundler.definition.dependencies.find do |d|
+        d.to_spec.full_gem_path == Dir.pwd
+      rescue Gem::MissingSpecError
+        false
+      end
+
       others.concat(this_gem.to_spec.dependencies) if this_gem
 
       excluded.each do |dependency|