Support undefined (noSuchIntance) values in Offline mode

ChangeLog

@@ -1,5 +1,11 @@
 SNMP::Info - Friendly OO-style interface to Network devices using SNMP.
 
+version 3.32 ()
+
+  [BUG FIXES]
+
+  * Support undefined (noSuchIntance) values in Offline mode
+
 version 3.31 (2016-01-22)
 
   [ENHANCEMENTS]

Info.pm

@@ -3814,7 +3814,7 @@ sub _global {
         # Return cached data unless loading
         # We now store in raw format so munge before returning
         # unless expecting raw data
-        if ( defined $self->{"_$attr"} && !$load ) {
+        if ( exists $self->{"_$attr"} && !$load ) {
             my $val = $self->{"_$attr"};
 
             if ( !$raw ) {