[#144] fix for empty additional options

Add additional options only if not empty.

fixes #144

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

@@ -74,7 +74,10 @@ 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("\\R")); //$NON-NLS-1$
 	}
 
 	private String stringValue(PreferenceMetadata<?> meta) {
@@ -110,7 +113,9 @@ public List<String> toList() {
 		}
 		list.add(NLS.bind("--query-driver={0}", queryDriver())); //$NON-NLS-1$
 
-		list.addAll(additionalOptions());
+		var additionalOptions = additionalOptions();
+		if (!additionalOptions.isEmpty())
+			list.addAll(additionalOptions);
 		return list;
 	}