Fix wscript for non-git builds

Issue: #16

Signed-off-by: Jiří Janoušek <[email protected]>

wscript

@@ -50,12 +50,15 @@ REVISION_SNAPSHOT = "snapshot"
 
 
 def get_git_version():
+	import os
 	import subprocess
-	try:
-		output = subprocess.Popen(["git", "describe", "--tags", "--long"], stdout=subprocess.PIPE).communicate()[0]
-		return output.decode("utf-8").strip().split("-")
-	except Exception as e:
-		return VERSION, "0", REVISION_SNAPSHOT
+	if os.path.isdir(".git"):
+		try:
+			output = subprocess.check_output(["git", "describe", "--tags", "--long"])
+			return output.decode("utf-8").strip().split("-")
+		except Exception as e:
+			print(e)
+	return VERSION, "0", REVISION_SNAPSHOT
 
 def add_version_info(ctx):
 	bare_version, n_commits, revision_id = get_git_version()