Catch panicing collectors (hello Nvidia Go Bindings) late.

collectors/metricCollector.go

@@ -13,6 +13,7 @@ import (
 type MetricGetter interface {
 	Name() string
 	Init(config []byte) error
+	Initialized() bool
 	Read(time.Duration, *[]lp.MutableMetric)
 	Close()
 }
@@ -30,6 +31,10 @@ func (c *MetricCollector) setup() error {
 	return nil
 }
 
+func (c *MetricCollector) Initialized() bool {
+	return c.init == true
+}
+
 func intArrayContains(array []int, str int) (int, bool) {
 	for i, a := range array {
 		if a == str {