Fix handling of branches without sources

An empty branch without sources, has been treated like an empty repository without any commits, branches or sources.

gradle/changelog/fix-handling-of-empty-branch-in-actionbar.yaml

@@ -0,0 +1,2 @@
+- type: fixed
+  description: Creation and Upload of a file for an empty branch with no sources

scm-ui/ui-components/src/Breadcrumb.tsx

@@ -268,7 +268,8 @@ const Breadcrumb: FC<Props> = ({
   const renderExtensionPoints = () => {
     if (
       binder.hasExtension<extensionPoints.ReposSourcesEmptyActionbar>("repos.sources.empty.actionbar", extProps) &&
-      sources?._embedded?.children?.length === 0
+      sources?._embedded?.children?.length === 0 &&
+      (repository.type !== "git" || sources.revision === "HEAD")
     ) {
       return (
         <ExtensionPoint<extensionPoints.ReposSourcesEmptyActionbar>