Exclude scripts with syntax errors from workspace preview

Signed-off-by: Ben Sherman <bentshermann@gmail.com>

Author: bentsherman

src/main/java/nextflow/lsp/services/script/WorkspacePreviewProvider.java

@@ -38,6 +38,7 @@ public WorkspacePreviewProvider(ScriptAstCache ast) {
 
     public Map<String,Object> preview() {
         var result = ast.getUris().stream()
+            .filter(uri -> !ast.hasSyntaxErrors(uri))
             .flatMap(uri -> definitions(uri))
             .toList();
         return Map.of("result", result);