Plotting signal with t=None

[lasofivec]

See PR #207 for more details

When plotting a signal computed with LOS_calc_signal(..., t=None, ...), the plot fails with:

Traceback (most recent call last):
File "examples/tutorials/plot_custom_emissivity.py", line 80, in
sig.plot()
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/data/_core.py", line 1657, in plot
draw=draw, connect=connect)
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/data/_plot.py", line 161, in Data_plot
fontsize=fontsize, draw=draw, connect=connect)
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/data/_plot.py", line 879, in _DataCam12D_plot
groupinit='time', follow=True)
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/utils.py", line 2681, in init
out = self._checkformat_dgrouprefaxobj(dgroup, dref, dobj, dax, ddata)
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/utils.py", line 3034, in _checkformat_dgrouprefaxobj
fgetval = get_valf(val, lrefs, linds)
File "/home/mendoza/miniconda3/envs/tofu3/lib/python3.7/site-packages/tofu-.1.4.1_145_ge5ffef4-py3.7-linux-x86_64.egg/tofu/utils.py", line 2468, in get_valf
assert ndim >= len(lrids)
AssertionError

Note: there was already another bug in devel that I corrected in bf_signal_tnone. Please fix this issue in the same branch.

[Didou09]

The problem was mostly due to:

• np.squeeze being used on a time of size = 1
• a data array of shape (1, n) which was being flattened by np.squeeze
• np.digitize which was trying to get digitize a time vector of size = 1

=> deactivated the call to np.squeeze, test on size of t introduced

PR #207 is up to date

[lasofivec]

so we can close this issue ?