Guard reportDescription against missing session vaccination

  A patient whose programme status is Vaccinated via historical doses
  (e.g. MMR catch-up cohort members with prior records) would throw
  when viewing the current session's page, because
  lastVaccinationOutcome filters by session uuid and returned undefined.

  Fall back to patientProgramme.lastVaccinationGiven and guard against
  a missing createdBy user.

Author: wrightmartin

app/models/patient-session.js

@@ -792,8 +792,18 @@ export class PatientSession {
    */
   get reportDescription() {
     switch (this.report) {
-      case PatientStatus.Vaccinated:
-        return `${this.patient?.firstName} was vaccinated by ${this.lastVaccinationOutcome.createdBy.fullName} on ${this.lastVaccinationOutcome.formatted.createdAt}.`
+      case PatientStatus.Vaccinated: {
+        const vaccination =
+          this.lastVaccinationOutcome ||
+          this.patientProgramme?.lastVaccinationGiven
+        if (!vaccination) {
+          return `${this.patient?.firstName} has been vaccinated.`
+        }
+        const by = vaccination.createdBy?.fullName
+        return by
+          ? `${this.patient?.firstName} was vaccinated by ${by} on ${vaccination.formatted.createdAt}.`
+          : `${this.patient?.firstName} was vaccinated on ${vaccination.formatted.createdAt}.`
+      }
       case PatientStatus.Due:
         return this.vaccineCriteria
           ? `${this.patient?.firstName} is ready to vaccinate (${this.vaccineCriteria.toLowerCase()}).`