feat: 🚑 make all secondary attributes nullable in QualityMetrics

some sorters don't output values expected by the table

Author: JaerongA

element_array_ephys/ephys_no_curation.py

@@ -1603,8 +1603,8 @@ class Waveform(dj.Part):
         -> master
         -> CuratedClustering.Unit
         ---
-        amplitude: float  # (uV) absolute difference between waveform peak and trough
-        duration: float  # (ms) time between waveform peak and trough
+        amplitude=null: float  # (uV) absolute difference between waveform peak and trough
+        duration=null: float  # (ms) time between waveform peak and trough
         halfwidth=null: float  # (ms) spike width at half max amplitude
         pt_ratio=null: float  # absolute amplitude of peak divided by absolute amplitude of trough relative to 0
         repolarization_slope=null: float  # the repolarization slope was defined by fitting a regression line to the first 30us from trough to peak