[Jungfrau][Dark] Account for dark runs not taken by the MDL device

Description

This MR is just for my sanity, but it doesn't offer an operational use.

Medium and Low gain doesn't matter in burst mode runs. Burst mode is always in high gain and the first dynamic gain dark run is what matters the most.

How Has This Been Tested?

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

@kluyvert

notebooks/Jungfrau/Jungfrau_dark_analysis_all_gains_burst_mode_NBC.ipynb

             acelltable -= sc_start
         # Only for dynamic medium and low gain runs [forceswitchg1, forceswitchg2] in burst mode.
 
-        if gain_mode == 0 and gain > 0 and memory_cells == 16:
+        if (
+            gain_mode == 0 and  # dynamic gain mode
+            gain > 0 and  # Medium and low runs
+            memory_cells == 16 and  # Burst mode
+            acelltable.shape[0] == 2  # forceswitchg1 and forceswitchg2 acquired with the MDL device.
+        ):
             # 255 similar to the receiver which uses the 255
             # value to indicate a cell without an image.
             # image shape for forceswitchg1 and forceswitchg2 = (1024, 512, 2, trains)