@Override
			public GThemeValueMap getLookAndFeelValues(LafType lafType) {
				return null;
			}
Version of ThemeManager that is used before an application or test installs a full
ApplicationThemeManager. Provides enough basic functionality used by the Gui class to
allow simple unit tests to run.
Ghidra/Framework/Gui/src/main/java/generic/theme/StubThemeManager.java