Fall back on planting icon when plant part icon does not exist

app/helpers/icons_helper.rb

@@ -92,7 +92,8 @@ module IconsHelper
   end
 
   def plant_part_icon(name)
-    image_icon "plant_parts/#{name}"
+    image_icon "plant_parts/#{name}" if Files.exists? Rails.root.join('app', 'assets', 'images', 'icons', "{name}.svg")
+    planting_icon
   end
 
   def crop_icon(crop)

spec/features/harvests/harvesting_a_crop_spec.rb

@@ -54,7 +54,7 @@ describe "Harvesting a crop", :js, :search do
     describe "Harvesting from crop page" do
       before do
         visit crop_path(maize)
-        click_link 'Record harvest'
+        click_link id: 'modalHarvestButton'
         click_link plant_part.name
       end
 
@@ -66,7 +66,7 @@ describe "Harvesting a crop", :js, :search do
       let!(:planting) { create :planting, crop: maize, owner: member, garden: member.gardens.first }
       before do
         visit planting_path(planting)
-        click_link "Record harvest"
+        click_link id: 'modalHarvestButton'
         click_link plant_part.name
       end