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

modules/agent-installer.js

@@ -15,8 +15,9 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-
-Object.defineProperty(Array.prototype, 'getParameterEx',
+try
+{
+    Object.defineProperty(Array.prototype, 'getParameterEx',
         {
             value: function (name, defaultValue)
             {
@@ -33,14 +34,19 @@ Object.defineProperty(Array.prototype, 'getParameterEx',
                 return (defaultValue);
             }
         });
-Object.defineProperty(Array.prototype, 'getParameter',
+    Object.defineProperty(Array.prototype, 'getParameter',
         {
             value: function (name, defaultValue)
             {
                 return (this.getParameterEx('--' + name, defaultValue));
             }
         });
-Object.defineProperty(Array.prototype, 'getParameterIndex',
+}
+catch(x)
+{ }
+try
+{
+    Object.defineProperty(Array.prototype, 'getParameterIndex',
         {
             value: function (name)
             {
@@ -55,7 +61,12 @@ Object.defineProperty(Array.prototype, 'getParameterIndex',
                 return (-1);
             }
         });
-Object.defineProperty(Array.prototype, 'deleteParameter',
+}
+catch(x)
+{ }
+try
+{
+    Object.defineProperty(Array.prototype, 'deleteParameter',
         {
             value: function (name)
             {
@@ -66,7 +77,12 @@ Object.defineProperty(Array.prototype, 'deleteParameter',
                 }
             }
         });
-Object.defineProperty(Array.prototype, 'getParameterValue',
+}
+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)
 {