test-runner: fix missing variable in the script

Fixes: #79

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
diff --git a/automated/utils/test-runner.py b/automated/utils/test-runner.py
index 16f5e30..33552b5 100755
--- a/automated/utils/test-runner.py
+++ b/automated/utils/test-runner.py
@@ -148,10 +148,10 @@
             try:
                 plan_version = test_plan['metadata'].get('format')
                 self.logger.info('Test plan version: {}'.format(plan_version))
+                tests = []
                 if plan_version == "Linaro Test Plan v2":
                     tests = test_plan['tests'][kind]
                 elif plan_version == "Linaro Test Plan v1" or plan_version is None:
-                    tests = []
                     for requirement in test_plan['requirements']:
                         if 'tests' in requirement.keys():
                             if requirement['tests'] and \