GODRIVER-2351 Add missing nil option checks (#883)

Author: benjirewis

mongo/collection.go

@@ -693,6 +693,9 @@ func (coll *Collection) ReplaceOne(ctx context.Context, filter interface{},
 
 	updateOptions := make([]*options.UpdateOptions, 0, len(opts))
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		uOpts := options.Update()
 		uOpts.BypassDocumentValidation = opt.BypassDocumentValidation
 		uOpts.Collation = opt.Collation
@@ -1276,6 +1279,9 @@ func (coll *Collection) FindOne(ctx context.Context, filter interface{},
 
 	findOpts := make([]*options.FindOptions, 0, len(opts))
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		findOpts = append(findOpts, &options.FindOptions{
 			AllowPartialResults: opt.AllowPartialResults,
 			BatchSize:           opt.BatchSize,

mongo/options/indexoptions.go

@@ -389,6 +389,9 @@ func MergeIndexOptions(opts ...*IndexOptions) *IndexOptions {
 	i := Index()
 
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		if opt.Background != nil {
 			i.Background = opt.Background
 		}

mongo/options/listdatabasesoptions.go

@@ -40,7 +40,7 @@ func (ld *ListDatabasesOptions) SetAuthorizedDatabases(b bool) *ListDatabasesOpt
 func MergeListDatabasesOptions(opts ...*ListDatabasesOptions) *ListDatabasesOptions {
 	ld := ListDatabases()
 	for _, opt := range opts {
-		if opts == nil {
+		if opt == nil {
 			continue
 		}
 		if opt.NameOnly != nil {

mongo/readpref/readpref.go

@@ -65,6 +65,9 @@ func New(mode Mode, opts ...Option) (*ReadPref, error) {
 	}
 
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		err := opt(rp)
 		if err != nil {
 			return nil, err

x/mongo/driver/topology/connection_options.go

@@ -67,6 +67,10 @@ func newConnectionConfig(opts ...ConnectionOption) (*connectionConfig, error) {
 	}
 
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+
 		err := opt(cfg)
 		if err != nil {
 			return nil, err

x/mongo/driver/topology/server_options.go

@@ -46,6 +46,9 @@ func newServerConfig(opts ...ServerOption) (*serverConfig, error) {
 	}
 
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		err := opt(cfg)
 		if err != nil {
 			return nil, err

x/mongo/driver/topology/topology_options.go

@@ -48,6 +48,9 @@ func newConfig(opts ...Option) (*config, error) {
 	}
 
 	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
 		err := opt(cfg)
 		if err != nil {
 			return nil, err