add paths to the optional chaining

scripts/build.js

@@ -25,10 +25,10 @@ function runBuild(entry, outfile) {
   if (!fs.existsSync("../pro/src")) {
     // If we don't have pro, we cannot bundle backend-core.
     // Otherwise, the main context will not be shared between libraries
-    delete tsconfigPathPluginContent?.compilerOptions?.paths[
+    delete tsconfigPathPluginContent?.compilerOptions?.paths?.[
       "@budibase/backend-core"
     ]
-    delete tsconfigPathPluginContent?.compilerOptions?.paths[
+    delete tsconfigPathPluginContent?.compilerOptions?.paths?.[
       "@budibase/backend-core/*"
     ]
   }