Return an empty branchmodel object.

`raw_data:`

One row is one datum. Stores coords in some space.

`dist_df:`

One row is one datum. Stores distances from each branch of the latent 'Y' shape (three columns).

`assignments:`

length is number of data points. Entries give rows of 'tips' corresponding to the closest branch.

`tips:`

Matrix with one row per branch (three total). One column per variable (same dimension as 'raw_data').

`models:`

List with one element per branch (three total). Currently supports only 'principal.curve' objects from the 'princurve' package.

`center:`

atomic of the same dimension as 'raw_data[1, ]'.

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