add test to make sure passing empty anat metrics works

giga_auto_qc/assessments.py

@@ -403,6 +403,12 @@ def quality_accessments(
         > qulaity_control_standards["functional_dice"]
     )
     functional_metrics["pass_func_qc"] = keep_fd * keep_proportion * keep_func
+    if anatomical_metrics.empty:
+        functional_metrics["pass_anat_qc"] = np.nan
+        functional_metrics["pass_all_qc"] = functional_metrics[
+            "pass_func_qc"
+        ].copy()
+        return functional_metrics
 
     # get the anatomical pass / fail
     pass_anat_qc = {}

giga_auto_qc/tests/test_assessments.py

@@ -31,6 +31,17 @@ def test_quality_accessments():
     )
     assert metrics["pass_all_qc"].astype(int).sum() == 1
 
+    metrics = assessments.quality_accessments(
+        functional_metrics=functional_metrics,
+        anatomical_metrics=pd.DataFrame(),
+        qulaity_control_standards=qc,
+    )
+    assert (
+        metrics["pass_all_qc"].astype(int).sum()
+        == metrics["pass_func_qc"].astype(int).sum()
+    )
+    assert metrics["pass_anat_qc"].isnull().all() == True
+
 
 def test_dice_coefficient():
     """Check the dice coefficient is calculated correctly."""