Tentative fix of plotSpectrum.m

[mychele]

Hi,
I get an error when the plotting is enabled with the "draw" boolean in the config file, at the iteration 47 of the main script (with nothing changed with respect to the latest commit in the master).
The error happens because plotSpectrums is trying to plot an empty vector.

Error using ylim (line 31)
Limits must be a 2-element vector of increasing numeric values.

Error in plotSpectrums (line 20)
          ylim([min(Fpsd) max(Fpsd)])

Error in simulate (line 250)
		[hSpectrums(1)] = plotSpectrums(Users,Stations);

Error in main (line 72)
		simulate(Param, simData, utilLo(iUtilLo), utilHi(iUtilHi));

This is a tentative fix, but I don't know if there are other elements to consider.
Best,
Michele

[jakthra]

I'll merge the fix, however it looks like an issue that's not just related to the spectrum plotting. The sig variable should not be empty if the user is scheduled. I'll look into it.

[jakthra]

Accepted for immediate bugfix. Issue created to look into the bug.