Disable only if the key an entry depends on is found in the reference map.

Addresses Issue #73

bin/FIJI/Settings.pm

@@ -722,8 +722,19 @@ sub _sanitize_fiu {
 
 sub _disabled_via_dependency {
     my ($map_ref, $consts_ref, $k) = @_;
-    my $dependency = $map_ref->{$k}->{'depends_on'};
-    return defined($dependency) && $map_ref->{$k}->{'type'} eq 'boolean' && !$consts_ref->{$dependency};
+    my $depends_on = $map_ref->{$k}->{'depends_on'};
+
+    # If we can't find the template for an entry in $map_ref, we assume
+    # everything's OK. 
+    # Rationale: We would need to pass >1 different maps to cross-check
+    # entries defined in other maps (e.g., FIU_LFSR_MASK in the FIUMAP depends on LFSR_MASK in the DESIGNMAP)
+
+
+    # For an entry to be disabled by a dependency, ...
+    return defined($depends_on)                           && # ... it must depend on something
+           defined($map_ref->{$depends_on})               && # ... that something must be found in the map
+           $map_ref->{$depends_on}->{'type'} eq 'boolean' && # ... that something must be of type boolean
+           !$consts_ref->{$depends_on};                      # ... that something must be set to false
 }
 
 sub _validate_hashmap {