Fixed #396 - change repeating end option leads to error if tags are involved

...ocker8/budgetmaster/controller/TransactionController.java

.../deadlocker8/budgetmaster/database/DatabaseParser_v3.java

...eadlocker8/budgetmaster/database/legacy/LegacyParser.java

...in/java/de/deadlocker8/budgetmaster/entities/tag/Tag.java

...e/deadlocker8/budgetmaster/entities/tag/TagScheduler.java

...ocker8/budgetmaster/entities/transaction/Transaction.java

...cker8/budgetmaster/entities/transaction/Transaction_.java

.../deadlocker8/budgetmaster/repositories/TagRepository.java

...ker8/budgetmaster/repositories/TransactionRepository.java

.../de/deadlocker8/budgetmaster/services/HelpersService.java

...a/de/deadlocker8/budgetmaster/services/ImportService.java

.../budgetmaster/services/report/ReportGeneratorService.java

...deadlocker8/budgetmaster/database/DatabaseImportTest.java

...dlocker8/budgetmaster/database/DatabaseParser_v3Test.java

...e/deadlocker8/budgetmaster/database/LegacyParserTest.java