Fix crash when widget config deserialization fails

core/ktx/build.gradle.kts

@@ -42,6 +42,7 @@ dependencies {
     implementation(libs.androidx.appcompat)
     implementation(libs.bundles.androidx.lifecycle)
     implementation(libs.commons.text)
+    implementation(libs.kotlinx.serialization.json)
 
     testImplementation(libs.bundles.tests)
 

core/ktx/src/main/java/de/mm20/launcher2/ktx/Json.kt

@@ -0,0 +1,14 @@
+package de.mm20.launcher2.ktx
+
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.decodeFromString
+
+inline fun <reified T>Json.decodeFromStringOrNull(json: String?): T? {
+    if (json == null) return null
+    return try {
+        decodeFromString(json)
+    } catch (e: SerializationException) {
+        null
+    }
+}