fix: illegal division by zero in percent estimation (#8783)

lib/ProductOpener/Ingredients.pm

@@ -2663,7 +2663,7 @@ sub init_percent_values ($total_min, $total_max, $ingredients_ref) {
 	# Go through each ingredient to set percent_min, percent_max, and if we can an absolute percent
 
 	foreach my $ingredient_ref (@{$ingredients_ref}) {
-		if (defined $ingredient_ref->{percent}) {
+		if ((defined $ingredient_ref->{percent}) and ($ingredient_ref->{percent} > 0)) {
 			# There is a specified percent for the ingredient.
 
 			if ($percent_mode eq "grams") {
@@ -4719,6 +4719,9 @@ sub preparse_ingredients_text ($product_lc, $text) {
 	}
 
 	$text =~ s/\"/"/g;
+	$text =~ s/\&lt;/</g;
+	$text =~ s/\&gt;/>/g;
+	$text =~ s/\&apos;/'/g;
 	$text =~ s/’/'/g;
 
 	# turn special chars to spaces

tests/unit/ingredients_percent.t

@@ -1064,6 +1064,48 @@ my @tests = (
 
 	],
 
+	# Trigger illegal division by zero - https://github.com/openfoodfacts/openfoodfacts-server/issues/8782
+	[
+		{
+			lc => "fr",
+			ingredients_text => 'légumes 0% (épices et aromates (contient oignon et safran <0.1%), sel)',
+		},
+		[
+			{
+				'id' => 'en:vegetable',
+				'ingredients' => [
+					{
+						'id' => 'en:herbs-and-spices',
+						'ingredients' => [
+							{
+								'id' => 'en:onion',
+								'percent_estimate' => 25,
+								'text' => 'contient oignon'
+							},
+							{
+								'id' => 'en:e164',
+								'percent' => '0.1',
+								'percent_estimate' => 25,
+								'text' => 'safran'
+							}
+						],
+						'percent_estimate' => 50,
+						'text' => "\x{e9}pices et aromates"
+					},
+					{
+						'id' => 'en:salt',
+						'percent_estimate' => 50,
+						'text' => 'sel'
+					}
+				],
+				'percent' => 0,
+				'percent_estimate' => 100,
+				'text' => "l\x{e9}gumes"
+			}
+		]
+
+	]
+
 );
 
 foreach my $test_ref (@tests) {