Fix an addTab method which would throw a StackTraceException since 1.4.14
Fix the icons not being shown on tabs if the application has closeable tabs
Avoid to throw a NullPointerException in the fireTab... methods if the queue is null
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Fix an addTab method which would throw a StackTraceException since 1.4.14
Fix the icons not being shown on tabs if the application has closeable tabs
Avoid to throw a NullPointerException in the fireTab... methods if the queue is null