Updated so if getParameter() is already defined, it will ignore redefinition

modules/agent-installer.js

@@ -15,7 +15,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-
+try
+{
     Object.defineProperty(Array.prototype, 'getParameterEx',
         {
             value: function (name, defaultValue)
@@ -40,6 +41,11 @@ Object.defineProperty(Array.prototype, 'getParameter',
                 return (this.getParameterEx('--' + name, defaultValue));
             }
         });
+}
+catch(x)
+{ }
+try
+{
     Object.defineProperty(Array.prototype, 'getParameterIndex',
         {
             value: function (name)
@@ -55,6 +61,11 @@ Object.defineProperty(Array.prototype, 'getParameterIndex',
                 return (-1);
             }
         });
+}
+catch(x)
+{ }
+try
+{
     Object.defineProperty(Array.prototype, 'deleteParameter',
         {
             value: function (name)
@@ -66,6 +77,11 @@ Object.defineProperty(Array.prototype, 'deleteParameter',
                 }
             }
         });
+}
+catch(x)
+{ }
+try
+{
     Object.defineProperty(Array.prototype, 'getParameterValue',
         {
             value: function (i)
@@ -75,6 +91,9 @@ Object.defineProperty(Array.prototype, 'getParameterValue',
                 return (ret);
             }
         });
+}
+catch(x)
+{ }
 
 function checkParameters(parms)
 {