Don't always run the script tests if there are no compile targets.

scripts/slave/recipes/chromium_trybot_legacy.expected/no_compile_because_of_analyze.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "linux_chromium_asan_rel",
@@ skipping 140 matching lines @@
     "name": "analyze",
     "~followup_annotations": [
       "@@@STEP_TEXT@No compile necessary@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"build_targets\": [], @@@",
       "@@@STEP_LOG_LINE@json.output@  \"status\": \"No dependency\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"targets\": []@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
-      "[SLAVE_BUILD]/src/testing/scripts/nacl_integration.py",
-      "--build-config-fs",
-      "Release",
-      "--paths",
-      "{\"build\": \"[BUILD]\", \"checkout\": \"[SLAVE_BUILD]/src\"}",
-      "--properties",
-      "{\"buildername\": \"linux_chromium_asan_rel\", \"buildnumber\": 571, \"slavename\": \"TestSlavename\"}",
-      "run",
-      "--output",
-      "/path/to/tmp/json"
-    ],
-    "name": "nacl_integration (with patch)",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"failures\": [], @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"valid\": true@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@"
-    ]
   }
 ]