fix: return early on unknown bedrock config (#31)

Fixes #30

Co-authored-by: Steffen Schmitz <steffen@langfuse.com>

Author: liger1978

internal/provider/llm_connections_resource.go

@@ -166,7 +166,10 @@ func (v llmConnectionConfigValidator) ValidateResource(ctx context.Context, req
 
 	switch adapter {
 	case "bedrock":
-		if configStr.IsNull() || configStr.IsUnknown() || configStr.ValueString() == "" {
+		if configStr.IsUnknown() {
+			return
+		}
+		if configStr.IsNull() || configStr.ValueString() == "" {
 			resp.Diagnostics.AddError(
 				"Config required for bedrock adapter",
 				"The bedrock adapter requires a config JSON string containing a \"region\" key.",

internal/provider/llm_connections_resource_unit_test.go

@@ -275,6 +275,12 @@ func TestLlmConnectionsResource_ConfigValidator(t *testing.T) {
 			config:      tftypes.NewValue(tftypes.String, `{"region":"us-east-1"}`),
 			expectError: false,
 		},
+		{
+			name:        "bedrock_unknown_config",
+			adapter:     "bedrock",
+			config:      tftypes.NewValue(tftypes.String, tftypes.UnknownValue),
+			expectError: false,
+		},
 		{
 			name:         "google_vertex_ai_missing_location",
 			adapter:      "google-vertex-ai",