Refine precision test print message

paddle/scripts/paddle_build.sh

@@ -1051,6 +1051,7 @@ set -x
             python3.7 $PADDLE_ROOT/tools/get_pr_ut.py
             if [[ -f "ut_list" ]]; then
                 set +x
+                echo "PREC length: "`wc -l ut_list`
                 precision_cases=`cat ut_list`
                 set -x
             fi

tools/get_pr_ut.py

@@ -242,6 +242,14 @@ class PRChecker(object):
                 else:
                     ut_list.extend(file_ut_map.get(f))
         ut_list = list(set(ut_list))
+
+        if check_added_ut:
+            with open('{}/added_ut'.format(PADDLE_ROOT)) as utfile:
+                for ut in utfile:
+                    print('PREC NEW UT: {}'.format(ut.rstrip('\r\n')))
+                    ut_list.append(ut.rstrip('\r\n'))
+
+        if ut_list:
             ret = self.__wget_with_retry(
                 'https://sys-p0.bj.bcebos.com/prec/prec_delta{}'.format(
                     self.suffix))
@@ -251,12 +259,7 @@ class PRChecker(object):
                         ut_list.append(ut.rstrip('\r\n'))
             else:
                 print('PREC download prec_delta failed')
-
+                exit(1)
-        if check_added_ut:
-            with open('{}/added_ut'.format(PADDLE_ROOT)) as utfile:
-                for ut in utfile:
-                    print('PREC NEW UT: {}'.format(ut.rstrip('\r\n')))
-                    ut_list.append(ut.rstrip('\r\n'))
 
         return '\n'.join(ut_list)