Merge pull request #42 from zetroot/bugfix/nre-on-report-save

Fixed NRE on report save

Author: zetroot

src/NTorSpectator.Database/Repositories/ReportsRepository.cs

@@ -3,6 +3,7 @@
 using NTorSpectator.Database.Models;
 using NTorSpectator.Services.Models;
 using NTorSpectator.Services.Persistent;
+using Observation = NTorSpectator.Database.Models.Observation;
 
 namespace NTorSpectator.Database.Repositories;
 
@@ -20,7 +21,11 @@ public ReportsRepository(DataContext context, ILogger<ReportsRepository> logger)
     public async Task SaveReport(Report report)
     {
         var siteList = await _context.Sites.ToListAsync();
-        var reportDal = new ObservationReport();
+        var reportDal = new ObservationReport
+        {
+            Observations = new List<Observation>(report.Observations.Count),
+            Events = new List<SiteAvailabilityEvent>(report.Events.Count)
+        };
         foreach (var observation in report.Observations)
         {
             var site = siteList.SingleOrDefault(x => x.SiteUri == observation.SiteUri);