base.saveCubeMap is broken more then in 1.5.4

[Treeform]

base.saveCubeMap would break if other buffers where running in 1.5.4 range
but in 1.6.0 cvs head it competently messes up the and cases tons of errors to come from

AssertionError: do_has_ram_image() at line 2688 of c:\p\panda3d\panda\src\gobj\texture.cxx
:display:gsg:glgsg(error): EXT_framebuffer_object reports non-framebuffer-completeness.
:display:gsg:glgsg(error): FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT

and then every frame after:
...
:display:gsg:glgsg(error): EXT_framebuffer_object reports non-framebuffer-completeness.
:display:gsg:glgsg(error): FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT
...
:display:gsg:glgsg(error): EXT_framebuffer_object reports non-framebuffer-completeness.
:display:gsg:glgsg(error): FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT
...