Fix program pagination: add fallback for to prevent GraphQL null errors

Author: Sbragul26

gatsby-node.js

@@ -460,15 +460,17 @@ exports.createPages = async ({ actions, graphql, reporter }) => {
 
 
   programs.forEach((program) => {
+    const programName = program.frontmatter.program || "default-program"; 
     envCreatePage({
       path: `/programs/${program.frontmatter.programSlug}`,
       component: `${MultiProgramPostTemplate}?__contentFilePath=${program.internal.contentFilePath}`,
       context: {
-        program: program.frontmatter.program,
+        program: programName,
       },
     });
   });
 
+
   if (!isFullSiteBuild) {
     const litePlaceholderPages = [
       {