fix bug propagating alignments when starting from 'original'

Author: mayofaulkner

atlaselectrophysiology/load_data.py

@@ -124,6 +124,7 @@ def get_previous_alignments(self):
             self.prev_align = sorted(self.prev_align, reverse=True)
             self.prev_align.append('original')
         else:
+            self.alignments = {}
             self.prev_align = ['original']
 
         return self.prev_align