Handle missing gems gracefully in tapioca gem command

lib/tapioca/commands/abstract_gem.rb

@@ -84,6 +84,8 @@ def gems_to_generate(gem_names)
           gem = @bundle.gem(gem_name)
 
           if gem.nil?
+            next say("Warning: Cannot find gem '#{gem_name}', skipping", :yellow) if @lsp_addon
+
             raise Thor::Error, set_color("Error: Cannot find gem '#{gem_name}'", :red)
           end
 

spec/tapioca/cli/gem_spec.rb

@@ -824,6 +824,22 @@ class Secret; end
           assert_success_status(result)
         end
 
+        it "skips missing gems and continues with warning when --lsp_addon is used" do
+          result = @project.tapioca("gem non_existent_gem --lsp_addon")
+
+          assert_stdout_includes(result, "Warning: Cannot find gem 'non_existent_gem', skipping")
+
+          assert_empty_stderr(result)
+          assert_success_status(result)
+        end
+
+        it "fails with error when gem cannot be found" do
+          result = @project.tapioca("gem non_existent_gem")
+
+          assert_stderr_includes(result, "Error: Cannot find gem 'non_existent_gem'")
+          refute_success_status(result)
+        end
+
         it "does not crash when the extras gem is loaded" do
           foo = mock_gem("foo", "0.0.1") do
             write!("lib/foo.rb", FOO_RB)