[#144] fix for empty additional options

- Add additional options only if not empty.
- Use all whitespace chars as separator for options to increase
robustness.

fixes #144

bundles/org.eclipse.cdt.lsp.clangd/src/org/eclipse/cdt/lsp/internal/clangd/ClangdPreferredOptions.java

@@ -74,7 +74,11 @@ public String queryDriver() {
 
 	@Override
 	public List<String> additionalOptions() {
-		return Arrays.asList(stringValue(metadata.additionalOptions()).split("\\R")); //$NON-NLS-1$
+		var options = stringValue(metadata.additionalOptions());
+		if (options.isBlank()) {
+			return new ArrayList<>();
+		}
+		return Arrays.asList(options.split("\\s+")); //$NON-NLS-1$
 	}
 
 	private String stringValue(PreferenceMetadata<?> meta) {