prazdy string -> continue

personalni/admin.py

@@ -8,6 +8,8 @@ from datetime import datetime
 @admin.action(description="Sjednoť telefony")
 def sjednot_telefony(admin, request, queryset):
 	for o in queryset:
+		if o.telefon == '':
+			continue
 		try:
 			telefon = int(o.telefon.replace(" ", "").replace("+", ""))
 			# 6 míst