void validateSource(String name, Address address, SymbolType symbolType, SourceType source) {
		if (!symbolType.isValidSourceType(source, address)) {
			String msg = "Can't set source to " + source + " for symbol '" + name +
				"' since it is a " + symbolType + " symbol type.";
			throw new IllegalArgumentException(msg);
		}
	}
Called by the NamespaceManager when a namespace is removed; remove all symbols that have the
given namespace ID.

@param namespaceID ID of namespace being removed
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java