Abort a test on nil containers, so that future tests don't panic

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Closes: #1111
Approved by: baude

vendor/github.com/stretchr/testify/require/requirements.go

@@ -0,0 +1,9 @@
+package require
+
+// TestingT is an interface wrapper around *testing.T
+type TestingT interface {
+	Errorf(format string, args ...interface{})
+	FailNow()
+}
+
+//go:generate go run ../_codegen/main.go -output-package=require -template=require.go.tmpl