fix: handle manifest without network

Author: Theodus

graph-gateway/src/network/internal/pre_processing.rs

@@ -202,12 +202,15 @@ fn into_subgraph_version_raw_info(
     let manifest = deployment
         .manifest
         .ok_or_else(|| anyhow!("missing manifest"))?;
+    let manifest_network = manifest
+        .network
+        .ok_or_else(|| anyhow!("manifest missing network"))?;
 
     let version_number = version.version;
     let version_deployment = DeploymentRawInfo {
         id: deployment_id,
         allocations: deployment_allocations,
-        manifest_network: manifest.network,
+        manifest_network,
         manifest_start_block: manifest.start_block,
         subgraphs: Default::default(),
         transferred_to_l2: deployment_transferred_to_l2,

graph-gateway/src/network/subgraph_client.rs

@@ -41,7 +41,7 @@ pub mod types {
     #[derive(Debug, Clone, Deserialize)]
     #[serde(rename_all = "camelCase")]
     pub struct Manifest {
-        pub network: String,
+        pub network: Option<String>,
         #[serde_as(as = "serde_with::DisplayFromStr")]
         pub start_block: BlockNumber,
     }