refactor(sql): ignore migration miss

plugins/sql/README.md

@@ -168,7 +168,6 @@ fn main() {
 
 To apply the migrations when the plugin is initialized, add the connection string to the `tauri.conf.json` file:
 
-> Notice: If `migration` is not provided, make sure that `preload` is kept empty
 
 ```json
 {

plugins/sql/src/lib.rs

@@ -145,14 +145,11 @@ impl Builder {
                     for db in config.preload {
                         let pool = DbPool::connect(&db, app).await?;
 
-                        if let Some(migration_map) = self.migrations.as_mut(){
-                            if let Some(migrations)= migration_map.remove(&db){
-                                let migrator = Migrator::new(migrations).await?;
-                                pool.migrate(&migrator).await?;
-                            }
-                        }
-                        else{
-                            panic!("No migrations providing. Please provide at least one migration or clear `preload` list");
+                        if let Some(migrations) =
+                            self.migrations.as_mut().and_then(|mm| mm.remove(&db))
+                        {
+                            let migrator = Migrator::new(migrations).await?;
+                            pool.migrate(&migrator).await?;
                         }
 
                         lock.insert(db, pool);