fix: api incompatibility with older versions

Author: lneugebauer

app/src/main/java/de/lukasneugebauer/nextcloudcookbook/recipe/data/dto/RecipePreviewDto.kt

@@ -2,10 +2,14 @@ package de.lukasneugebauer.nextcloudcookbook.recipe.data.dto
 
 import com.google.gson.annotations.SerializedName
 import de.lukasneugebauer.nextcloudcookbook.recipe.domain.model.RecipePreview
+import kotlin.jvm.Throws
 
 data class RecipePreviewDto(
+    @Deprecated(message = "As of Cookbook v0.10.3, this field is deprecated.", replaceWith = ReplaceWith(expression = "id"))
+    @SerializedName("recipe_id")
+    val recipeId: String?,
     @SerializedName("id")
-    val id: String,
+    val id: String?,
     @SerializedName("name")
     val name: String,
     @SerializedName("keywords")
@@ -21,9 +25,10 @@ data class RecipePreviewDto(
     @SerializedName("imagePlaceholderUrl")
     val imagePlaceholderUrl: String?,
 ) {
+    @Throws(IllegalStateException::class)
     fun toRecipePreview() =
         RecipePreview(
-            id = id,
+            id = if (!id.isNullOrBlank()) id else recipeId ?: throw IllegalStateException("Both 'id' and 'recipe_id' are null or blank"),
             name = name,
             keywords = keywords?.split(",")?.toSet() ?: emptySet(),
             category = category ?: "",