Merge pull request #259 from asmorkalov:manager_outofbound_fix

android/service/engine/src/org/opencv/engine/manager/ManagerActivity.java

@@ -402,7 +402,13 @@ public class ManagerActivity extends Activity
 
     protected String NormalizeVersion(String OpenCVersion, String PackageVersion)
     {
+        if (OpenCVersion == null || PackageVersion == null)
+            return "unknown";
+
         int dot = PackageVersion.indexOf(".");
+        if (dot == -1 || OpenCVersion.length() == 0)
+            return "unknown";
+        else
             return OpenCVersion.substring(0,  OpenCVersion.length()-1) + "." +
                 OpenCVersion.toCharArray()[OpenCVersion.length()-1] + "." +
                 PackageVersion.substring(0, dot) + " rev " + PackageVersion.substring(dot+1);