Merge branch 'sentry-empty-data' into 'dev'

fix(data): aborts if no data

See merge request !37

src/index.js

@@ -142,7 +142,7 @@ async function start(fields, cozyParameters) {
       dataStartDate.format('YYYY-MM-DD'),
       dataEndDate.format('YYYY-MM-DD')
     )
-    if (!grdfData) {
+    if (grdfData.length == 0) {
       log('debug', 'No data found')
       transaction.setStatus(Tracing.SpanStatus.Ok)
       transaction.finish()
@@ -163,6 +163,7 @@ async function start(fields, cozyParameters) {
       rangeDate.day.doctype,
       rangeDate.day.keys
     )
+
     const { year: firstYear, month: firstMonth } = grdfData[0]
 
     log('debug', 'Aggregate GRDF yearly load data')