Исправление NRE

.semver.txt

@@ -1 +1 @@
-1.0.91
+1.0.92

src/JiraTimeBot/Properties/AssemblyInfo.cs

@@ -26,6 +26,6 @@ using System.Runtime.InteropServices;
 //                                                                                  
 // You can specify all the values or you can default the Build and Revision Numbers                                                                                  
 // by using the '*' as shown below:                                                                                  
-[assembly: AssemblyVersion("1.0.91")] 
-[assembly: AssemblyFileVersion("1.0.91")] 
-[assembly: AssemblyInformationalVersion("1.0.91")] 
+[assembly: AssemblyVersion("1.0.92")] 
+[assembly: AssemblyFileVersion("1.0.92")] 
+[assembly: AssemblyInformationalVersion("1.0.92")] 

src/JiraTimeBot/RepositoryProviders/GitLog.cs

@@ -184,7 +184,7 @@ namespace JiraTimeBot.RepositoryProviders
             bool directBranchHasBeenFound = false;
             foreach (var branch in repo.Branches)
             {
-                if (branch.Tip.Sha != commitSha)
+                if (branch.Tip?.Sha != commitSha)
                 {
                     continue;
                 }