fix: fail if no stages were found (#1970)

* fix: fail if no stages were found

Adds a warning message if act is cannot find any stages to run
with the filters provided.

Reproduction:
- run `act -j gibberish`

Desired behavior: some indication I did something silly
Actual behavior: no output, just exit with success.

As a human who often makes spelling mistakes,
it would be nice if act warned me what I was doing that was silly
rather than exiting apparently doing
nothing with no obvious indication
I did something wrong.

* Revert "fix: fail if no stages were found"

This reverts commit 226adf1c15cf4c01d516a05dc923507e6999978d.

* fix: fail if no stages were found

Errors if no stages were found with the given filters.
Prints out a helpful error message, pointing users
in the right place for how to specify which stage to run.

Reproduction:
- run `act -j gibberish`

Desired behavior: some indication I did something silly
Actual behavior: no output, just exit with success.

As a human who often makes spelling mistakes,
it would be nice if act warned me what I was doing that was silly
rather than exiting apparently doing
nothing with no obvious indication
I did something wrong.

act/model/planner.go

@@ -328,8 +328,6 @@ func createStages(w *Workflow, jobIDs ...string) ([]*Stage, error) {
 		jobIDs = newJobIDs
 	}
 
-	var err error
-
 	// next, build an execution graph
 	stages := make([]*Stage, 0)
 	for len(jobDependencies) > 0 {
@@ -350,8 +348,8 @@ func createStages(w *Workflow, jobIDs ...string) ([]*Stage, error) {
 		stages = append(stages, stage)
 	}
 
-	if len(stages) == 0 && err != nil {
-		return nil, err
+	if len(stages) == 0 {
+		return nil, fmt.Errorf("Could not find any stages to run. View the valid jobs with `act --list`. Use `act --help` to find how to filter by Job ID/Workflow/Event Name")
 	}
 
 	return stages, nil