CB-14048: (android) allowedSchemes check empty string fix #268
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Motivation
The new AllowSchemes introduced with inappbrowser@3.0.0 doesn't check if AllowSchemes contains empty string after having being loaded, respectively only if null, which could lead to error in case a custom scheme is use but not set as white listed schema
What I mean is that, if no preference would be set in config.xml but a custom scheme would be used (my case) then the variable allowSchemes won't be null but will contains an empty string
Fix for https://issues.apache.org/jira/browse/CB-14048