Avoid demo data using an exisiting account number
Avoid demo data using an exisiting account number

Fixes #26
lbelorgey/bank-statement-import,hbrunn/bank-statement-import,rschnapka/bank-statement-import,acsone/bank-statement-import,Antiun/bank-statement-import,NL66278/bank-statement-import,Endika/bank-statement-import,open-synergy/bank-statement-import,VitalPet/bank-statement-import