Merge #10931: Fix misleading "Method not found" multiwallet errors
df389bc Change wallet method disabled error text (Russell Yanofsky)
e526b3d Fix misleading "Method not found" multiwallet errors (Russell Yanofsky)
Pull request description:
Raise RPC_WALLET_NOT_SPECIFIED instead of RPC_METHOD_NOT_FOUND when a required
wallet filename was not specified in an RPC call.
Also raise more specific RPC_WALLET_NOT_FOUND error instead of
RPC_INVALID_PARAMETER in case an invalid wallet was specified, for consistency.
Tree-SHA512: 6a8d885283f69bcfc28f2e08ac03eff02f9f8160a312ce2a90d868aa52533434fc0b4c4ab86547c2f09392338956df915637eaf7136a4fc105e6c8179f2d0ac8