Bug 182190 [StatusHandling] [Wizards] getControl assert on wizard page has no message
M6 If you forget to set the control on your wizard page our assert gives no feedback. We need an error message.
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
}
            }
            /* (non-Javadoc)
             * @see org.eclipse.jface.wizard.ProgressMonitorPart#clearBlocked()
             */
            public void clearBlocked() {
                super.clearBlocked();
                if (!lockedUI) {
					getBlockedHandler().clearBlocked();
				}
            }
            /* (non-Javadoc)
             * @see org.eclipse.jface.wizard.ProgressMonitorPart#beginTask(java.lang.String, int)
             */
            public void beginTask(String name, int totalWork) {
                super.beginTask(name, totalWork);
                currentTask = name;
            }
            /* (non-Javadoc)
             * @see org.eclipse.jface.wizard.ProgressMonitorPart#setTaskName(java.lang.String)
             */
            public void setTaskName(String name) {
                super.setTaskName(name);
                currentTask = name;
            }
            /* (non-Javadoc)
             * @see org.eclipse.jface.wizard.ProgressMonitorPart#subTask(java.lang.String)
             */
            public void subTask(String name) {
                super.subTask(name);