fix: skip signature check if base64PublicKey is null

[renedecandido]

If the license key is NULL the signature check is skipped (as stated in the readme file "You can pass NULL if you would like to skip this check")

[vitas]

without comment why that change is required, you should rather use TextUtils.isEmpty(publicKey) for consistency and remove such check below in if statement to clean it up

[renedecandido]

As described in the library's README.md you can pass NULL instead of the License Key to skip the purchase signature verification. In case of a NULL License Key the library returned false and broke the normal purchase flow which is not desired in case you are checking the signature on a server.

[serggl]

this is a fair pull request. Just give me some time to merge it

On Thu, Feb 26, 2015 at 5:15 PM René De Candido [email protected]
wrote:

As described in the library's README.md you can pass NULL instead of the
License Key to skip the purchase signature verification. In case of a NULL
License Key the library returned false and broke the normal purchase flow
which is not desired in case you are checking the signature on a server.

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#68 (comment)
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[serggl]

actually, I would like to move this check from Security.verifyPurchase to BillingProcessor.verifyPurchaseSignature method. And also this should be done with TextUtils.isEmpty like @vitas mentioned.

Would you mind to apply these changes?