no schema case

Author: paula-stacho

packages/compass-schema/src/components/export-schema-modal.tsx

@@ -195,6 +195,7 @@ const ExportSchemaModal: React.FunctionComponent<{
             variant="primary"
             isLoading={!downloadUrl}
             loadingIndicator={<SpinLoader />}
+            disabled={!exportedSchema}
           >
             Export
           </Button>

packages/compass-schema/src/stores/schema-export-reducer.ts

@@ -214,15 +214,15 @@ const prepareDownload = (): SchemaThunkAction<void> => {
   return (dispatch, getState, { track, connectionInfoRef, namespace }) => {
     let stage = 'initial';
     const { exportedSchema, exportFormat } = getState().schemaExport;
+    if (!exportedSchema) return;
 
     try {
       stage = 'stringify';
       // const stringified = JSON.stringify({ abc: 1 }, null, 2);
 
       stage = 'blob';
       // TODO: schema is already stringified. are edge cases handled?
-      // TODO: no schema case
-      const blob = new Blob([exportedSchema || ''], {
+      const blob = new Blob([exportedSchema], {
         type: 'application/json',
       });
       const filename = `schema-${exportFormat}-${namespace}.json`;