changes concerning exception handling

Snmp2Mysql/Program.cs

@@ -35,6 +35,8 @@ namespace Snmp2Mysql
                             }
                         }
 
+						try 
+						{
                         	SnmpGetterResultProvider res = snmpGetter.Exec();
                         	foreach (SnmpGetterResult r in res)
                         	{
@@ -42,6 +44,10 @@ namespace Snmp2Mysql
                             	dc.add((int)r.Index, r.Value);
                         	}
 						} 
+						catch (SnmpGetterException e) {
+							Console.WriteLine ("no result: {0}", e.Message);
+						}
+                    }
                 }
             }
         }

Snmp2Mysql/SnmpGetter.cs

@@ -140,7 +140,7 @@ namespace Snmp2Mysql
             {
                 mPacket = (SnmpV2Packet)mTarget.Request(mPdu, mParams);
             }
-            catch (SnmpNetworkException e)
+            catch (SnmpException e)
             {
                 throw new SnmpGetterException(e.Message, e);
             }