CA-122644: Fixes issue where a vmware package was not detected as such and hence
the import crashed. Some missing null checks.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
CP-6093: When the folders view is selected the Search panel should show the same
things as the main treeview.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
CP-6093: Further corrections to the enabled state of the top ToolStripButtons.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>