Fix wallets scan upload faults

parsers/survex.py

@@ -1528,6 +1528,12 @@ def LoadSurvexBlocks():
     survexblockroot = SurvexBlock(name=ROOTBLOCK, survexpath="", cave=None, survexfile=survexfileroot, 
             legsall=0, legslength=0.0)
     # crashes here sometimes on MariaDB complaining that cave_id should not be null. But it should be.
+    #django.db.utils.IntegrityError: (1048, "Column 'cave_id' cannot be null")
+    # fix by restarting db on server
+    # sudo service mariadb stop
+    # sudo service mariadb start
+
+
     survexblockroot.save()
 
     print(' - Loading Survex Blocks...')