(Bug) Dutch/Minted: whitelisted investor can't buy if decimals equals certain values

[dennis00010011b]

Issue reproducible with decimals = 9,10

Issue isn't reproducible with decimals=16,18

Steps for reproduce:

1. Create Dutch crowdsale with parameters:
   {
   "name": "scenarioDutchRopsten.json",
   "ticker": "test",
   "decimals": 10,
   "totalSupply":100,
   "walletAddress":"0x56B2e3C3cFf7f3921Dc2e0F8B8e20d1eEc29216b",
   "gasprice":50,
   "burnExcess":false,
   "tiers":[
   {
   "isWhitelisted":true,
   "startDate": "240000",
   "startTime": "240000",
   "endDate":"72000000",
   "endTime":"72000000",
   "minCap":11,
   "minRate":1000,
   "maxRate":10000,
   "supply": 100,
   "whitelist":[{
   "address": "0xDb0E42Ee8fDaAd8A7f295f447F71A1480c98a373",
   "min": 50,
   "max": 150
   } ]
   }]
   }
   (value of start/end time means adjustment in ms from the moment of filling the forms on Step3)

2. Set whitelisted account in metamask

3. Open Contribution page, wait until crowdsale starts

4. Buy amount more than minCap ( ex. 75 tokens )

Expected result:

• whitelisted investor should be able to buy allowed amount without issues

Actual result:

• investor not able to buy
• although one or more errors occured in transaction
• wrong eth amount passes to metamask
• error in browser's console

Transactions:
https://ropsten.etherscan.io/tx/0x977a541a655dc2c4d4d6c7fc775292b0c77a21dadb395cffb798aa9721ff1ca6
https://ropsten.etherscan.io/tx/0xd167b0d1a8cf145922ad0a53e7e9a8c330c611631262218abccbd8d5a0cf50d2

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

Ropsten

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

ExecID: 0x81ad2053f41bc53918c3f6504dc38ccb5d225cc869dac19c8c30e35286bbd62e

Do you have screenshots showing the problem?

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

dutch-whitelist-decimals10.log

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