Indices: _calc_pe_lists: call _calc_pe if needed to populate cache

Most of the time _calc_pe will have been called previously
so the cache will exist.  However there are occasions where
this is not done, for example the range weighted phylo
turnover calcs.

That calc has also now been simplified.

lib/Biodiverse/Indices/Phylogenetic/RefAlias.pm

@@ -218,8 +218,13 @@ sub _calc_pe_lists {
     my (%wts, %local_ranges, %results);
 
     foreach my $group (@$element_list_all) {
-        #  this is populated by _calc_pe
+        #  this is populated by _calc_pe under the calc dependency system
         my $results_this_gp = $results_cache->{$group};
+        #  but can be called directly so need to handle that and populate the cache
+        if (!exists $results_this_gp->{PE_WTLIST}) {
+            $self->_calc_pe(%args);
+            $results_this_gp = $results_cache->{$group};
+        }
 
         #  Avoid some redundant slicing and dicing when we have only one group
         #  Pays off when processing large data sets
@@ -274,7 +279,13 @@ sub _calc_pe_lists_hierarchical {
     my (%wts, %local_ranges, %results);
 
     foreach my $group (@$child_names) {
+        #  this is populated by _calc_pe under the calc dependency system
         my $results_this_gp = $results_cache->{$group};
+        #  but can be called directly so need to handle that and populate the cache
+        if (!exists $results_this_gp->{PE_WTLIST}) {
+            $self->_calc_pe(%args);
+            $results_this_gp = $results_cache->{$group};
+        }
 
         #  Avoid some redundant slicing and dicing when we have only one group
         #  Pays off when processing large data sets

lib/Biodiverse/Indices/RWTurnover.pm

@@ -346,16 +346,10 @@ sub _calc_pe_lists_per_element_set {
         $results[$i]
             = $have_cache
             ? $cache->{$elements[0]}
-            : {  #  messy but we need results from both
-                $self->_calc_pe(
-                    %args,
-                    element_list_all => $args{$list_name},
-                ),
-                $self->_calc_pe_lists(
-                    %args,
-                    element_list_all => $args{$list_name},
-                ),
-            };
+            : $self->_calc_pe_lists(
+                %args,
+                element_list_all => $args{$list_name},
+            );
           $cache->{$elements[0]} = $results[$i]
             if @elements == 1;
     }