commits fix for issue 3450. _repr_cov_params now uses self.chol_cov

Author: Dpananos

pymc3/distributions/multivariate.py

@@ -143,7 +143,7 @@ def _repr_cov_params(self, dist=None):
         if dist is None:
             dist = self
         if self._cov_type == 'chol':
-            chol = get_variable_name(self.chol)
+            chol = get_variable_name(self.chol_cov)
             return r'\mathit{{chol}}={}'.format(chol)
         elif self._cov_type == 'cov':
             cov = get_variable_name(self.cov)