fix: return no accounts if eth_accounts is deprecated

Erigon now responds that `eth_accounts` is deprecated. Instead of
crashing we now return an empty set of accounts, the same as if running
against mainnet.

Fixes #5572.

Author: kanej

packages/hardhat-ethers/src/internal/helpers.ts

@@ -40,7 +40,15 @@ function isArtifact(artifact: any): artifact is Artifact {
 export async function getSigners(
   hre: HardhatRuntimeEnvironment
 ): Promise<HardhatEthersSigner[]> {
-  const accounts: string[] = await hre.ethers.provider.send("eth_accounts", []);
+  let accounts: string[];
+
+  try {
+    accounts = await hre.ethers.provider.send("eth_accounts", []);
+  } catch (error) {
+    console.log(error);
+    console.log(JSON.stringify(error));
+    return [];
+  }
 
   const signersWithAddress = await Promise.all(
     accounts.map((account) => getSigner(hre, account))