fix startup exception on fresh installations

scm-webapp/src/main/java/sonia/scm/ScmUpgradeHandler.java

@@ -91,6 +91,9 @@ public class ScmUpgradeHandler
     File configDirectory = new File(baseDirectory, "config");
     File versionFile = new File(configDirectory, "version.txt");
 
+    if (configDirectory.exists())
+    {
+
       // pre version 1.2
       if (!versionFile.exists())
       {
@@ -103,6 +106,13 @@ public class ScmUpgradeHandler
         fixDate(configDirectory);
       }
 
+      // fresh installation
+    }
+    else
+    {
+      IOUtil.mkdirs(configDirectory);
+    }
+
     writeVersionFile(versionFile);
   }