Merge #19261: refactor: Drop ::HasWallets()

ccf1f6e refactor: Drop ::HasWallets() (João Barbosa)

Pull request description:

  Minor follow-up of #19250. The global `HasWallets()` is used only once and at the call site there's already a way to know if any wallet is loaded.

ACKs for top commit:
  MarcoFalke:
    ACK ccf1f6e
  hebasto:
    ACK ccf1f6e, I have reviewed the changes and they look OK, I agree they can be merged.

Tree-SHA512: fb902c045cbd331eaf71716c04734520f2ce7f2b317db510c4ce140162bbc683327b5a40ac860f6cde5add37e069065274d39dfa147fac2091eedec505f2f7eb

Author: MarcoFalke

src/wallet/rpcwallet.cpp

@@ -106,7 +106,7 @@ std::shared_ptr<CWallet> GetWalletForJSONRPCRequest(const JSONRPCRequest& reques
         return wallets[0];
     }
 
-    if (!HasWallets()) {
+    if (wallets.empty()) {
         throw JSONRPCError(
             RPC_METHOD_NOT_FOUND, "Method not found (wallet method is disabled because no wallet is loaded)");
     }

src/wallet/wallet.cpp

@@ -77,12 +77,6 @@ bool RemoveWallet(const std::shared_ptr<CWallet>& wallet)
     return true;
 }
 
-bool HasWallets()
-{
-    LOCK(cs_wallets);
-    return !vpwallets.empty();
-}
-
 std::vector<std::shared_ptr<CWallet>> GetWallets()
 {
     LOCK(cs_wallets);

src/wallet/wallet.h

@@ -51,7 +51,6 @@ void UnloadWallet(std::shared_ptr<CWallet>&& wallet);
 
 bool AddWallet(const std::shared_ptr<CWallet>& wallet);
 bool RemoveWallet(const std::shared_ptr<CWallet>& wallet);
-bool HasWallets();
 std::vector<std::shared_ptr<CWallet>> GetWallets();
 std::shared_ptr<CWallet> GetWallet(const std::string& name);
 std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, bilingual_str& error, std::vector<bilingual_str>& warnings);