Add `hou.hipFile.isNewFile()` to indicate if the current file is still in a 'new file' state, i.e. hasn't been saved or loaded yet. This is currently only accurately reflected in a GUI Houdini session, non-GUI sessions will compare the filename to HOUDINI_HIP_DEFAULT_NAME.

Add `hou.hipFile.isNewFile()` to indicate if the current file is still in a 'new file' state, i.e. hasn't been saved or loaded yet. This is currently only accurately reflected in a GUI Houdini session, non-GUI sessions will compare the filename to HOUDINI_HIP_DEFAULT_NAME.

Add `hou.hipFile.isNewFile()` to indicate if the current file is still in a 'new file' state, i.e. hasn't been saved or loaded yet. This is currently only accurately reflected in a GUI Houdini session, non-GUI sessions will compare the filename to HOUDINI_HIP_DEFAULT_NAME.