ArgumentNullException thrown

[caitlinsalt]

On updating the OTA website the following exception was thrown

Unhandled Exception: System.AggregateException: One or more errors occurred. (Value cannot be null.
Parameter name: s) ---> System.ArgumentNullException: Value cannot be null.
Parameter name: s
   at System.Convert.FromBase64String(String s)
   at StorageTool.Lib.AzureBlob.AzureStorageBlob.HashEquals(IDataObject other) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\AzureBlob\AzureStorageBlob.cs:line 50
   at StorageTool.Lib.AzureBlob.AzureStorageBlobFolder.StoreItemAsync(IDataObject source, CloudBlockBlob dest, IUserFeedback feedback, SemaphoreSlim semaphore, OneWaySynchronisationOptions options) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\AzureBlob\AzureStorageBlobFolder.cs:line 26
   at StorageTool.Lib.AzureBlob.AzureStorageBlobDirectory.StoreItemAsync(IDataObject source, String name, IUserFeedback feedback, SemaphoreSlim semaphore, OneWaySynchronisationOptions options) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\AzureBlob\AzureStorageBlobDirectory.cs:line 53
   at StorageTool.Lib.Synchroniser.<>c__DisplayClass1_0.<<PushAsync>b__0>d.MoveNext() in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 54
--- End of stack trace from previous location where exception was thrown ---
   at StorageTool.Lib.Synchroniser.PushAsync(IFolder source, IFolder dest, IUserFeedback feedback, OneWaySynchronisationOptions options, SemaphoreSlim semaphore) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 67
   at StorageTool.Lib.Synchroniser.<>c__DisplayClass1_0.<<PushAsync>b__0>d.MoveNext() in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 63
--- End of stack trace from previous location where exception was thrown ---
   at StorageTool.Lib.Synchroniser.PushAsync(IFolder source, IFolder dest, IUserFeedback feedback, OneWaySynchronisationOptions options, SemaphoreSlim semaphore) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 67
   at StorageTool.Lib.Synchroniser.<>c__DisplayClass1_0.<<PushAsync>b__0>d.MoveNext() in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 63
--- End of stack trace from previous location where exception was thrown ---
   at StorageTool.Lib.Synchroniser.PushAsync(IFolder source, IFolder dest, IUserFeedback feedback, OneWaySynchronisationOptions options, SemaphoreSlim semaphore) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 67
   at StorageTool.Lib.Synchroniser.SyncAsync(IFolder source, IFolder dest, IUserFeedback feedback, SynchronisationOptions options, SemaphoreSlim semaphore) in C:\Users\Will\Source\Repos\storage-tool\StorageTool.Lib\Synchroniser.cs:line 23
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at StorageTool.Program.RunTool(Options options) in C:\Users\Will\Source\Repos\storage-tool\StorageTool\Program.cs:line 70
   at CommandLine.ParserResultExtensions.WithParsed[T](ParserResult`1 result, Action`1 action)
   at StorageTool.Program.Main(String[] args) in C:\Users\Will\Source\Repos\storage-tool\StorageTool\Program.cs:line 19

This occurred after content had been uploaded, but it is not clear whether content had been uploaded completely.