ci: guard coverage combine against empty coverage glob in fast shards (#2630)

Signed-off-by: Aurelien Chartier <2567591+achartier@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: achartier

tests/functional/L1_Functional_Tests_AutoModel.sh

@@ -42,4 +42,6 @@ run_test      uv run --no-sync bash ./tests/functional/sft_automodel_lora.sh
 run_test      uv run --no-sync bash ./tests/functional/test_automodel_extra_installed_correctly.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Eval.sh

@@ -39,4 +39,6 @@ run_test      uv run --no-sync bash ./tests/functional/eval_async.sh
 run_test fast uv run --no-sync bash ./tests/functional/eval_audio.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_GRPO_1.sh

@@ -44,4 +44,6 @@ run_test fast uv run --no-sync bash ./tests/functional/grpo_dp_simple.sh
 run_test fast uv run --no-sync bash ./tests/functional/grpo_dp_mooncake.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_GRPO_2.sh

@@ -40,4 +40,6 @@ run_test      uv run --no-sync bash ./tests/functional/grpo_multiturn.sh
 run_test      uv run --no-sync bash ./tests/functional/grpo_non_colocated.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_GRPO_3.sh

@@ -39,4 +39,6 @@ run_test fast uv run --no-sync bash ./tests/functional/grpo_topp_topk.sh
 run_test      uv run --no-sync bash ./tests/functional/vlm_grpo.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Gym.sh

@@ -37,4 +37,6 @@ run_test() {
 run_test fast uv run --no-sync bash ./tests/functional/grpo_async_gym.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Megatron_1.sh

@@ -41,4 +41,6 @@ run_test fast uv run --no-sync bash ./tests/functional/grpo_megatron_eagle3_onli
 run_test      uv run --no-sync bash ./tests/functional/grpo_megatron_generation.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Megatron_2.sh

@@ -40,4 +40,6 @@ run_test fast uv run --no-sync bash ./tests/functional/dpo_megatron_lora.sh
 run_test      uv run --no-sync bash ./tests/functional/sft_megatron_lora.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Megatron_3.sh

@@ -40,4 +40,6 @@ run_test      uv run --no-sync bash ./tests/functional/dpo_megatron.sh
 run_test      uv run --no-sync bash ./tests/functional/sft_megatron.sh
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi

tests/functional/L1_Functional_Tests_Other_1.sh

@@ -52,4 +52,6 @@ if [[ "${FAST:-0}" != "1" ]]; then
 fi
 
 cd ${PROJECT_ROOT}/tests
-coverage combine .coverage*
+if compgen -G ".coverage*" > /dev/null; then
+    coverage combine .coverage*
+fi