Showing wrong error message for invalid parameters

[nus-se-bot]

Describe the bug
When invalid parameters are used (eg. c/) for addBook and editBook, the error message does not identify these as invalid. Rather, the application treats them as part of the input for the previous valid parameter, making the program not work as intended.

To Reproduce
Steps to reproduce the behavior:

1. Type 'editBook 6 t/fantasy n/One Year of Solitude a/John Mayer m/5 c/Yes'

2. See error about incorrect input to the m/ parameter instead of the invalid c/ parameter

3. Type 'addBook t/fantasy n/Two Years of Solitude c/hello m/5 a/John Mayer'

4. See incorrect behaviour - no error is produced and the 'c/hello' is added to the name of the book

Expected behavior
Either the invalid parameter tag should be ignored, or an error saying that it is an invalid parameter should be shown.

Screenshots

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Reported by: @whyjayxp
Severity: Medium

_{[original: nus-cs2103-AY1819S2/pe-dry-run#397]}