Add qualityTables when no donuts pass.

python/lsst/ts/wep/task/calcZernikesTask.py

@@ -346,8 +346,10 @@ def createZkTable(
 
         return zkTable
 
-    def empty(self) -> pipeBase.Struct:
-        """Return empty results if no donuts are available."""
+    def empty(self, qualityTable=None) -> pipeBase.Struct:
+        """Return empty results if no donuts are available. If
+        it is a result of no quality donuts we still include the
+        quality table results instead of an empty quality table."""
         qualityTableCols = [
             "SN",
             "ENTROPY",
@@ -356,11 +358,15 @@ def empty(self) -> pipeBase.Struct:
             "FINAL_SELECT",
             "DEFOCAL_TYPE",
         ]
+        if qualityTable is None:
+            donutQualityTable = QTable({name: [] for name in qualityTableCols})
+        else:
+            donutQualityTable = qualityTable
         return pipeBase.Struct(
             outputZernikesRaw=np.atleast_2d(np.full(len(self.nollIndices), np.nan)),
             outputZernikesAvg=np.atleast_2d(np.full(len(self.nollIndices), np.nan)),
             zernikes=self.initZkTable(),
-            donutQualityTable=QTable({name: [] for name in qualityTableCols}),
+            donutQualityTable=donutQualityTable,
         )
 
     @timeMethod
@@ -396,7 +402,7 @@ def run(
                 or len(selectionIntra.donutStampsSelect) == 0
             ):
                 self.log.info("No donut stamps were selected.")
-                return self.empty()
+                return self.empty(qualityTable=donutQualityTable)
         else:
             donutQualityTable = QTable([])