feat: Ensure model is not run if validation fails

cerealblotchmodels/templates/cerealblotchmodels/barleynetblotchform.html

@@ -362,9 +362,11 @@
 		} else if (selectedWeatherdataType === "weatherstation") {
 			if(theForm["weatherStationId"].options[theForm["weatherStationId"].selectedIndex].value == "-1") {
 				alert("Mangler værstasjon")
+				return false;
 			}
 		} else {
 			alert("Mangler type værdatakilde")
+			return false;
 		}
 
 		// Observation: Either no fields or all fields must be set

cerealblotchmodels/templates/cerealblotchmodels/septoriahumiditymodelform.html

@@ -430,6 +430,7 @@
 			}
 		} else {
 			alert("Mangler type værdatakilde")
+			return false;
 		}
 		return true;
 	}