solve failing when conf_int='none'

[rsignell-usgs]

solve is failing when conf_int='none'.

For example, if I try changing conf_int='linear' to conf_int='none' in cell [5] of the utide_uv_example.ipynb notebook, I get:

solve: matrix prep ... solution ... diagnostics ... 
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-10-359a0567fa71> in <module>
      7              method='ols',
      8              conf_int='none',
----> 9              Rayleigh_min=0.95,)

~/miniconda3/envs/pangeo/lib/python3.7/site-packages/utide/_solve.py in solve(t, u, v, lat, **opts)
    198     compat_opts = _process_opts(opts, v is not None)
    199 
--> 200     coef = _solv1(t, u, v, lat, **compat_opts)
    201 
    202     return coef

~/miniconda3/envs/pangeo/lib/python3.7/site-packages/utide/_solve.py in _solv1(tin, uin, vin, lat, **opts)
    377     # Diagnostics.
    378     if not opt['nodiagn']:
--> 379         coef, indPE = ut_diagn(coef, opt)
    380 
    381     # Re-order constituents.

~/miniconda3/envs/pangeo/lib/python3.7/site-packages/utide/diagnostics.py in ut_diagn(coef, opt)
     15 
     16         SNR = (coef['Lsmaj']**2 + coef['Lsmin']**2) / (
---> 17             (coef['Lsmaj_ci']/1.96)**2 +
     18             (coef['Lsmin_ci']/1.96)**2)
     19 

KeyError: 'Lsmaj_ci'