Check input file for additional entries

This will prevent the application from creating output without these
additional entities, which would be missing in output.

Instead, the application will exit with an error message.

src/model/unterformular.rs

@@ -28,6 +28,7 @@ use crate::model::Ordner;
 use crate::model::{Ansichten, Entries, Filter, MenuCategory, PlausibilityRules, Script};
 
 #[derive(Serialize, Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
 pub struct Unterformular {
     #[serde(rename = "DataCatalogues")]
     data_catalogues: DataCatalogues,
@@ -170,12 +171,14 @@ impl Unterformular {
 }
 
 #[derive(Serialize, Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
 pub struct DataCatalogues {
     #[serde(rename = "DataCatalogue")]
     data_catalogue: Vec<String>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
 pub struct Entry {
     #[serde(rename = "@parentId")]
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -363,6 +366,7 @@ pub struct Entry {
 }
 
 #[derive(Serialize, Deserialize, Debug)]
+#[serde(deny_unknown_fields)]
 pub struct DataFormEntries {
     #[serde(rename = "EntryName")]
     #[serde(skip_serializing_if = "Option::is_none")]