13. If a partner, being a trustee, improperly employs trust property in the business or on the account of the partnership, no other partner is liable for the trust property to the persons beneficially interested therein:
Provided that —
(a)
this section shall not affect any liability incurred by any partner by reason of his having notice of a breach of trust; and
(b)
nothing in this section shall prevent trust money from being followed and recovered from the firm if still in its possession or under its control.