chore: enable nullable for SummaryTable.cs

Author: filzrev

src/BenchmarkDotNet/Reports/SummaryTable.cs

@@ -7,6 +7,8 @@
 using Perfolizer.Horology;
 using Perfolizer.Metrology;
 
+#nullable enable
+
 namespace BenchmarkDotNet.Reports
 {
     public class SummaryTable
@@ -36,24 +38,26 @@ internal SummaryTable(Summary summary, SummaryStyle? style = null)
                 FullHeader = Array.Empty<string>();
                 FullContent = Array.Empty<string[]>();
                 FullContentStartOfHighlightGroup = Array.Empty<bool>();
+                FullContentStartOfLogicalGroup = Array.Empty<bool>();
                 FullContentWithHeader = Array.Empty<string[]>();
                 IsDefault = Array.Empty<bool>();
+                EffectiveSummaryStyle = summary.Style ?? SummaryStyle.Default;
                 return;
             }
 
             // Ensure we have all required data for styling
             style = style ?? summary.Style ?? SummaryStyle.Default;
             if (style.TimeUnit == null)
             {
-                style = style.WithTimeUnit(TimeUnit.GetBestTimeUnit(summary.Reports.Where(r => r.ResultStatistics != null).Select(r => r.ResultStatistics.Mean)
+                style = style.WithTimeUnit(TimeUnit.GetBestTimeUnit(summary.Reports.Where(r => r.ResultStatistics != null).Select(r => r.ResultStatistics!.Mean)
                     .ToArray()));
             }
 
             if (style.SizeUnit == null)
             {
                 style = style.WithSizeUnit(SizeUnit.GetBestSizeUnit(summary.Reports
                     .Where(r => r.GcStats.GetBytesAllocatedPerOperation(r.BenchmarkCase).HasValue)
-                    .Select(r => r.GcStats.GetBytesAllocatedPerOperation(r.BenchmarkCase).Value)
+                    .Select(r => r.GcStats.GetBytesAllocatedPerOperation(r.BenchmarkCase)!.Value)
                     .ToArray()));
             }
             EffectiveSummaryStyle = style;