Don't output results heading if there are none

Fix a little text output glitch when --show-successes is not set.

Note: I realized that `or` in a go template can take more than two
parameters, so that's why the nested or was removed.

Drive-by fix while working on...
Ref: https://issues.redhat.com/browse/EC-758

cmd/validate/image_test.go

@@ -1240,7 +1240,6 @@ func TestValidateImageDefaultOutput(t *testing.T) {
 		Component: Unnamed
 		ImageRef: registry/image:tag
 
-		Results:
 	`)
 
 	cases := []struct {
@@ -1254,6 +1253,7 @@ func TestValidateImageDefaultOutput(t *testing.T) {
 		{
 			args: append(commonArgs, "--show-successes"),
 			expected: fmt.Sprintf("%s%s", commonOutput, hd.Doc(`
+				Results:
 				✓ [Success] policy.nice
 				  ImageRef: registry/image:tag
 				  Title: Very nice

internal/applicationsnapshot/templates/text_report.tmpl

@@ -7,7 +7,7 @@ Result: {{ $t.Result }}
 Violations: {{ $t.Failures }}, Warnings: {{ $t.Warnings }}, Successes: {{ $t.Successes }}{{ nl -}}
 
 {{- template "_components.tmpl" $c -}}
-{{- if or (or (gt $t.Failures 0) (gt $t.Warnings 0)) (gt $t.Successes 0) -}}
+{{- if or (gt $t.Failures 0) (gt $t.Warnings 0) (and (gt $t.Successes 0) $r.ShowSuccesses) -}}
 Results:{{ nl -}}
 {{- if gt $t.Failures 0 -}}
   {{- template "_results.tmpl" (toMap "Components" $c "Type" "Violation") -}}