Don't use a broken version string when git is not found

make.ps1

@@ -60,6 +60,9 @@ function Version-Command
 		$version = $command[1]
 	}
 	elseif (Get-Command 'git' -ErrorAction SilentlyContinue)
+	{
+		$gitRepo = git rev-parse --is-inside-work-tree
+		if ($gitRepo)
 		{
 			$version = git name-rev --name-only --tags --no-undefined HEAD 2>$null
 			if ($version -eq $null)
@@ -68,6 +71,11 @@ function Version-Command
 			}
 		}
 		else
+		{
+			echo "Not a git repository. The version will remain unchanged."
+		}
+	}
+	else
 	{	
 		echo "Unable to locate Git. The version will remain unchanged."
 	}