[PnP] Fix regression finding latest cumulative summary (#3353)

Regressed with #3324

Since that PR changed the `summaryFrom` to always return an object with zeros, this check on line 64 failed.
Updated to check to ignore zeros, or fallback to returning zeros.

Regrettably this would've been caught had this eslint rule been enabled:
https://github.com/SeedCompany/cord-api-v3/blob/79875d5134689bf979bfd42a73d6b7c430a2ff2c/.eslintrc.cjs#L190-L191

src/components/progress-summary/progress-summary.extractor.ts

@@ -61,12 +61,12 @@ const findLatestCumulative = (currentYear: Row<ProgressSheet>) => {
   // eslint-disable-next-line no-constant-condition
   while (true) {
     const summary = summaryFrom(currentYear, ...sheet.columnsForCumulative);
-    if (summary) {
+    if (summary.planned > 0 || summary.actual > 0) {
       return summary;
     }
     currentYear = currentYear.move(-1);
     if (currentYear < sheet.summaryFiscalYears.start.row) {
-      return null;
+      return summary;
     }
   }
 };
@@ -75,7 +75,7 @@ const summaryFrom = (
   fiscalYear: Row<ProgressSheet>,
   plannedColumn: Column,
   actualColumn: Column,
-): Progress => {
+) => {
   let planned = fiscalYear.cell(plannedColumn).asNumber ?? 0;
   let actual = fiscalYear.cell(actualColumn).asNumber ?? 0;
   const normalize = (val: number) => {
@@ -88,7 +88,7 @@ const summaryFrom = (
   };
   planned = normalize(planned);
   actual = normalize(actual);
-  return { planned, actual };
+  return { planned, actual } satisfies Progress;
 };
 
 const MismatchedReportingQuarter = PnpProblemType.register({