Add error handling when one of the workers cannot be loaded.

lib/ronin/recon/cli/commands/run.rb

@@ -385,6 +385,9 @@ def load_workers
             if (level = options[:intensity])
               @workers = @workers.intensity(level)
             end
+          rescue Ronin::Recon::ClassNotFound => error
+            print_error(error.message)
+            exit(1)
           end
 
           #

spec/cli/commands/run_spec.rb

@@ -330,6 +330,32 @@
         expect(subject.workers.map(&:intensity)).to all(eq(intensity))
       end
     end
+
+    context "when one of the enabled workers cannot be found" do
+      let(:worker) { 'does/not/exist' }
+      before { subject.enable_workers << worker }
+
+      it "must print an error and exit with 1" do
+        expect(subject).to receive(:print_error).with("could not find file for #{worker.inspect}")
+        expect(subject).to receive(:exit).with(1)
+
+        subject.load_config
+        subject.load_workers
+      end
+    end
+
+    context "when one of the enabled worker files does not exist" do
+      let(:worker_file) { 'does/not/exist' }
+      before { subject.worker_files << worker_file }
+
+      it "must print an error and exit with 1" do
+        expect(subject).to receive(:print_error).with("no such file or directory: #{File.expand_path(worker_file).inspect}")
+        expect(subject).to receive(:exit).with(1)
+
+        subject.load_config
+        subject.load_workers
+      end
+    end
   end
 
   describe "#parse_value" do