don't emit constructor input packing method if the contract constructor has no inputs

Author: jwasinger

accounts/abi/bind/source2.go.tpl

@@ -63,10 +63,12 @@ var (
 		return &{{.Type}}{abi: *parsed}, nil
 	}
 
+    {{ if .Constructor.Inputs }}
 	func ({{ decapitalise $contract.Type}} *{{$contract.Type}}) PackConstructor({{range .Constructor.Inputs}} {{.Name}} {{bindtype .Type $structs}}, {{end}}) []byte {
 		res, _ := {{ decapitalise $contract.Type}}.abi.Pack("" {{range .Constructor.Inputs}}, {{.Name}}{{end}})
 		return res
 	}
+	{{ end -}}
 
 	{{range .Calls}}
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.

accounts/abi/bind/v2/internal/contracts/db/bindings.go

@@ -24,7 +24,7 @@ contract C {
 }
 
 // purpose of this is to test that generation of metadata for contract that emits one error produces valid Go code
-contract 2C2 {
+contract C2 {
     function Foo() public pure {
         revert BadThing({
             arg1: uint256(0),

accounts/abi/bind/v2/internal/contracts/events/bindings.go

@@ -0,0 +1 @@
+{"contracts":{"contract.sol:MyContract":{"abi":[{"inputs":[],"name":"GetNums","outputs":[{"internalType":"uint256[5]","name":"","type":"uint256[5]"}],"stateMutability":"pure","type":"function"}],"bin":"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"}},"version":"0.8.26+commit.8a97fa7a.Darwin.appleclang"}

accounts/abi/bind/v2/internal/contracts/nested_libraries/bindings.go

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.26;
+
+contract MyContract {
+    // emit multiple events, different types
+    function GetNums() public pure returns (uint256[5] memory) {
+        uint256[5] memory myNums = [uint256(0), uint256(1), uint256(2), uint256(3), uint256(4)];
+        return myNums;
+    }
+}