[BUG] router.APIContainer.RegisterDependency not works with zero input function

[yz89122]

Describe the bug The following code will produce panic.

package main

import (
	"github.com/kataras/iris/v12"
)

func main() {
	app := iris.Default()
	app.ConfigureContainer(func(api *iris.APIContainer) {
		api.RegisterDependency(func() float64 {
			return float64(1)
		})
	})
}

To Reproduce

1. In main.go

   package main
   
   import (
       "github.com/kataras/iris/v12"
   )
   
   func main() {
       app := iris.Default()
       app.ConfigureContainer(func(api *iris.APIContainer) {
   	    api.RegisterDependency(func() float64 {
   		    return float64(1)
   	    })
       })
   }
   

2. Run ( go run main.go )
3. Panic

   [DBUG] 2021/07/22 22:09 Log level set to "debug"
   [DBUG] 2021/07/22 22:09 Using <./access.log> to log requests
   [DBUG] 2021/07/22 22:09 Using <UUID4> to identify requests
   panic: bad value: function has zero inputs
   
   goroutine 1 [running]:
   github.com/kataras/iris/v12/hero.fromFunc(0x1894580, 0x1a24730, 0x13, 0xc00027fb00, 0x100f600)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:144 +0x4cb
   github.com/kataras/iris/v12/hero.resolveDependency(0x1894580, 0x1a24730, 0x13, 0xc0002cd500, 0xc00027fb00, 0xc00027fa40, 0xc, 0xc, 0x1)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:90 +0x151
   github.com/kataras/iris/v12/hero.newDependency(0x1894580, 0x1a24730, 0xc000288f00, 0xc00027fa40, 0xc, 0xc, 0x1823387)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:77 +0x1dc
   github.com/kataras/iris/v12/hero.(*Container).Register(0xc0002f4cb0, 0x1894580, 0x1a24730, 0xc000277500)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/container.go:284 +0x6a
   github.com/kataras/iris/v12/core/router.(*APIContainer).RegisterDependency(...)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/core/router/api_container.go:71
   main.main.func1(0xc000267800)
           /Users/yz/workspace/test/main.go:10 +0x47
   github.com/kataras/iris/v12/core/router.(*APIBuilder).ConfigureContainer(0xc000273e60, 0xc00051ff70, 0x1, 0x1, 0xffffffff)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/core/router/api_builder.go:335 +0x64
   main.main()
           /Users/yz/workspace/test/main.go:9 +0x66
   exit status 2
   

Expected behavior No panic

Desktop (please complete the following information):

• OS: macOS Big Sur 11.4
• go: 1.16

iris.Version

• v12.2.0-alpha2