Fixed data type of hasStripeData in member importer

refs https://github.com/TryGhost/Team/issues/1076

- What appeared to be a "boolean" by nature and name, the hasStripeData was holding a result of "find" method - and object or an undefined value
- Fixed the typing, to avoid ambiguity in the future

ghost/members-importer/lib/importer.js

@@ -86,9 +86,9 @@ module.exports = class MembersCSVImporter {
         const numberOfBatches = Math.ceil(rows.length / batchSize);
         const mappedCSV = membersCSV.unparse(rows, columns);
 
-        const hasStripeData = rows.find(function rowHasStripeData(row) {
+        const hasStripeData = !!(rows.find(function rowHasStripeData(row) {
             return !!row.stripe_customer_id || !!row.complimentary_plan;
-        });
+        }));
 
         await fs.writeFile(outputFilePath, mappedCSV);
 

ghost/members-importer/test/importer.test.js

@@ -246,7 +246,7 @@ describe('Importer', function () {
 
             result.batches.should.equal(2);
             should.exist(result.metadata);
-
+            should.equal(result.metadata.hasStripeData, false);
             fsWriteSpy.calledOnce.should.be.true();
         });