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Matplotlib 3.7 breaks nyquist_plot() #864

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@henklaak

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@henklaak
>>> nyquist(tf([1],[1,1]))Traceback (most recent call last):  File "/home/henklaak/Software/python-control/examples/secord-matlab.py", line 8, in <module>    nyquist(tf([1],[1,1]))  File "/home/henklaak/Software/python-control/control/matlab/wrappers.py", line 109, in nyquist    _, contour = nyquist_plot(syslist, omega, *args, **kwargs)                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  File "/home/henklaak/Software/python-control/control/freqplot.py", line 1027, in nyquist_plot    plt.plot(  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/pyplot.py", line 2785, in plot    return gca().plot(           ^^^^^^^^^^^  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/axes/_axes.py", line 1690, in plot    self.add_line(line)  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/axes/_base.py", line 2304, in add_line    self._update_line_limits(line)  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/axes/_base.py", line 2327, in _update_line_limits    path = line.get_path()           ^^^^^^^^^^^^^^^  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/lines.py", line 1029, in get_path    self.recache()  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/matplotlib/lines.py", line 681, in recache    self._x_filled[nanmask] = np.interp(                              ^^^^^^^^^^  File "<__array_function__ internals>", line 200, in interp  File "/home/henklaak/anaconda3/envs/bla/lib/python3.11/site-packages/numpy/lib/function_base.py", line 1595, in interp    return interp_func(x, xp, fp, left, right)           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ValueError: array of sample points is empty

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