[BLUEJ-1014] Class documentation view shows blank (on first view)

Even though the class documetation ha no issue and the class is compiled, the documentation is empty and the status states that it is 'Done'.

The debug-log has a warning: {quote}WARNING: Could not resolve '-fx-text-background-color' while resolving lookups for '-fx-text-fill' from rule '*.label' in stylesheet jar:file:/.../BlueJ/jdk/jre/lib/ext/jfxrt.jar!/com/sun/javafx/scene/control/skin/modena/modena.bss"{quote}

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