Merge pull request #5425 from ab9rf/getplants-crash

resolve `getplants` crash

Author: myk002

docs/changelog.txt

@@ -56,6 +56,7 @@ Template for new versions:
 ## New Features
 
 ## Fixes
+- `getplants`: will no longer crash when faced with plants with growths that do not drop seeds when processed
 
 ## Misc Improvements
 

plugins/getplants.cpp

@@ -154,9 +154,10 @@ selectability selectablePlant(color_ostream& out, const df::plant_raw* plant, bo
                 bool seedSource = plant->growths[i]->item_type == df::item_type::SEEDS;
 
                 if (plant->growths[i]->item_type == df::item_type::PLANT_GROWTH) {
-                    for (size_t k = 0; growth_mat.material->reaction_product.material.mat_type.size(); k++) {
-                        if (growth_mat.material->reaction_product.material.mat_type[k] == plant->material_defs.type[plant_material_def::seed] &&
-                            growth_mat.material->reaction_product.material.mat_index[k] == plant->material_defs.idx[plant_material_def::seed]) {
+                    auto& mat = growth_mat.material->reaction_product.material;
+                    for (size_t k = 0; k < mat.mat_type.size(); k++) {
+                        if (mat.mat_type[k] == plant->material_defs.type[plant_material_def::seed] &&
+                            mat.mat_index[k] == plant->material_defs.idx[plant_material_def::seed]) {
                             seedSource = true;
                             break;
                         }