ParseException in view history command

[nus-pe-bot]

This does not crash the application, but it is not handled properly.

view history h/ 11/1/19 to 11/2/19
java.text.ParseException: Unparseable date: ""
at java.base/java.text.DateFormat.parse(DateFormat.java:395)
at command.Process.viewhistory(Process.java:662)
at command.Parser.parse(Parser.java:38)
at AlphaNUS.run(AlphaNUS.java:46)
at AlphaNUS.main(AlphaNUS.java:55)

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_{[original: Inno97/ped#10]}