isEmpty Abfrage entfernt und in validData Methode hinzugefügt
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		@@ -21,16 +21,6 @@ public class Login {
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        while (true) {
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            while(password.isEmpty() || phoneNumber.isEmpty())
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            {
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                System.out.println("Login fehlgeschlagen. Eingabe ist leer, versuchen Sie es erneut.");
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                System.out.println("");
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                System.out.print("Telefonnummer: ");
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                phoneNumber = leser.nextLine();
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                System.out.print("Passwort: ");
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                password = leser.nextLine();
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            }
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            boolean error = false;
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            error = isError(error, phoneNumber);
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