Revamped condition evaluation

Now warnings from condition evaluation are passed down to Slave

lib/SugarTrail/Template/Master.pm

 
     STEP: foreach my $master_step (@{ $self->{steps} }) {
         my $accept = 1;
+        my $slave_step = {
+            line        => $master_step->{line},
+            warnings    => []
+        };
         COND: foreach my $condstr (@{ $master_step->{conds} }) {
             my $c = SugarTrail::Template::Condition->new($condstr);
-            unless ($c->match($args)) { $accept = 0; last COND; }
+            my ($r, $w) = $c->match($args);
+
+            # if warnings, store them, prepare to accept and ignore result
+            if (scalar @$w) {
+                $accept = 1;
+                push @{$slave_step->{warnings}}, @$w;
+                next COND;
+            } else {
+                # point of no warnings -- refusal should be valid here
+                $accept = 0 unless $r;
+            }
         }
-        push @slave_steps, $master_step->{line} if $accept;
+
+        push @slave_steps, $slave_step
+            if ($accept || scalar @{$slave_step->{warnings}});
     }
 
     $slave->{meta}->{'Stm'} = $self->{stm};