SPICE Command. Edit analysis tab. DC sweep. Nonexisting 2nd source enabled for 2nd sweep.

Description

Steps to reproduce

1. Create any circuit with only ONE source (for instance, a voltage source).
2. Go to Inspect/Simulator.
3. New Analysis Tab: Create a DC sweep on the unique source. For instance from 0 to 10, step 0.1.
4. Run the analysis (you may plot anything).
5. In Simulation/Edit Analysis Tab, you can see that the checklist for Source 2 is enabled, when it should be disabled.

KiCad Version 8.0.0 (downloaded on 2024/02/25).

In the simulation, if you enter in "Simulation/Edit Analysis Tab" and the analysis was DC sweep, in the first window ("SPICE Command") the checklist of source 2 is enabled, although my analysis only had sweep in one source (because the circuit only had one source, in this case). I think that, in such case, the checklist of source 2 should be disabled (in fact, confirming without any change gives an error: "A DC source must be specified").

Application:  x64 on x64

Version: 8.0.0, release build

Libraries:
	wxWidgets 3.2.4
	FreeType 2.12.1
	HarfBuzz 8.3.0
	FontConfig 2.14.2

Platform: Windows 10 (build 19045), 64-bit edition, 64 bit, Little endian, wxMSW

	wxWidgets: 3.2.4 (wchar_t,wx containers)
	Boost: 1.83.0
	OCC: 7.7.1
	Curl: 8.5.0-DEV
	ngspice: 42
	Compiler: Visual C++ 1936 without C++ ABI

Build settings: