don't allow setting image quality to empty value, #3894

src/services/options.js

@@ -10,7 +10,7 @@ function getOptionOrNull(name) {
         // e.g. in initial sync becca is not loaded because DB is not initialized
         option = sql.getRow("SELECT * FROM options WHERE name = ?", name);
     }
-    
+
     return option ? option.value : null;
 }
 
@@ -27,13 +27,17 @@ function getOption(name) {
 /**
  * @returns {number}
  */
-function getOptionInt(name) {
+function getOptionInt(name, defaultValue = undefined) {
     const val = getOption(name);
 
     const intVal = parseInt(val);
 
     if (isNaN(intVal)) {
-        throw new Error(`Could not parse "${val}" into integer for option "${name}"`);
+        if (defaultValue === undefined) {
+            throw new Error(`Could not parse "${val}" into integer for option "${name}"`);
+        } else {
+            return defaultValue;
+        }
     }
 
     return intVal;