json: return an error when failing to unmarshal

README.md

@@ -96,7 +96,7 @@ Json = bf.JSONMarshal()
 bf.Mtx.Unlock()
 
 // restore a bloom filter from storage 
-bfNew := bbloom.JSONUnmarshal(Json)
+bfNew, _ := bbloom.JSONUnmarshal(Json)
 
 isInNew := bfNew.Has([]byte("butter"))    // should be true
 isNotInNew := bfNew.Has([]byte("Butter")) // should be false

bbloom.go

@@ -264,11 +264,14 @@ func (bl *Bloom) JSONMarshalTS() ([]byte, error) {
 // JSONUnmarshal
 // takes JSON-Object (type bloomJSONImExport) as []bytes
 // returns bloom32 / bloom64 object
-func JSONUnmarshal(dbData []byte) *Bloom {
+func JSONUnmarshal(dbData []byte) (*Bloom, error) {
 	bloomImEx := bloomJSONImExport{}
-	json.Unmarshal(dbData, &bloomImEx)
+	err := json.Unmarshal(dbData, &bloomImEx)
+	if err != nil {
+		return nil, err
+	}
 	bf := NewWithBoolset(bloomImEx.FilterSet, bloomImEx.SetLocs)
-	return bf
+	return bf, nil
 }
 
 // FillRatio returns the fraction of bits set.

bbloom_test.go

@@ -75,7 +75,10 @@ func TestM_JSON(t *testing.T) {
 	}
 
 	// create new bloomfilter from bloomfilter's JSON representation
-	bf2 := JSONUnmarshal(Json)
+	bf2, err := JSONUnmarshal(Json)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	cnt2 := 0
 	for i := range wordlist1 {