Warn on non-existent variables instead of error'ing; bump to 0.1.8

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ch-grafana-cache"
-version = "0.1.7"
+version = "0.1.8"
 edition = "2021"
 
 [dependencies]

src/grafana.rs

@@ -17,10 +17,9 @@ impl VariablesConfig {
         let variables: HashSet<&String> = dashboard.variables().map(|v| &v.name).collect();
         for var in self.0.keys() {
             if !variables.contains(var) {
-                anyhow::bail!(
+                warn!(
                     "Variable {} does not exist in the dashboard (variables: {:?})",
-                    var,
-                    variables
+                    var, variables
                 );
             }
         }