improved run_focus_absorption readability

Author: andy-bridger

Testing/SystemTests/tests/framework/ISIS_PowderPolarisTest.py

@@ -634,28 +634,22 @@ def run_focus_absorption(run_number, paalman_pings=False):
     shutil.copy(original_splined_path, spline_path)
 
     inst_object = setup_inst_object("PDF", with_container=True)
+    focus_kwargs = {}
     if paalman_pings:
         inst_object._inst_settings.empty_can_subtraction_method = "PaalmanPings"  # the default is Simple
         inst_object._inst_settings.paalman_pings_events_per_point = 1
-
-        return inst_object.focus(
-            run_number=run_number,
-            input_mode="Summed",
-            do_van_normalisation=True,
-            do_absorb_corrections=True,
-            sample_empty=sample_empty,
-            multiple_scattering=False,
-        )
     else:
-        return inst_object.focus(
-            run_number=run_number,
-            input_mode="Summed",
-            do_van_normalisation=True,
-            do_absorb_corrections=True,
-            sample_empty=sample_empty,
-            sample_empty_scale=sample_empty_scale,
-            multiple_scattering=False,
-        )
+        focus_kwargs["sample_empty_scale"] = sample_empty_scale
+
+    return inst_object.focus(
+        run_number=run_number,
+        input_mode="Summed",
+        do_van_normalisation=True,
+        do_absorb_corrections=True,
+        sample_empty=sample_empty,
+        multiple_scattering=False,
+        **focus_kwargs,
+    )
 
 
 def setup_mantid_paths():