(Bug) Add validation to decimal : if field is empty

[dennis00010011b]

Related #632

Problem:

User able to proceed with wizard if decimal field is empty. As a result deployment can't be finished.

If you are reporting a problem with Token Wizard, please include the following information:

Which network did you use? (Mainnet, Kovan, Rinkeby, etc.)

Kovan, Rinkeby

If you were able to create it, what is the URL of your crowdsale?

*weren't able *

Do you have screenshots showing the problem?

wizard.poa.network-1519763968231.log

Do you see errors in the dev console? If yes, please include a screenshot

To open the dev console in Google Chrome, press F12, or go to View -> Developer -> Developer Tools, and open the Console tab

If you see errors, please right click on them and "Save as..". Zip saved file and attach it to the Issue.

wizard.poa.network-1519763968231.log

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[fernandomg]

@dennis00010011b I couldn't reproduce it in production.

[dennis00010011b]

@fernandomg It still possible if user return back from step 3. Then decimal field is empty but user can click button 'Continue and proceed.
#635

[fernandomg]

@dennis00010011b oh, I see. So this should be solved as part of the solution of #637 then.

[fernandomg]

This bug was fixed as part of #705