fix: Fall back to JSON when response is not table-friendly

Some API responses (e.g. ask-ava-sync) return plain strings or other
non-tabular data that caused table rendering to error out. Now gracefully
falls back to indented JSON output instead of failing.

Author: apgiorgi

main.go

@@ -881,7 +881,12 @@ func (t dciTableContentType) Marshal(value interface{}) ([]byte, error) {
 
 	rows, err := toTableRows(jsonSafe)
 	if err != nil {
-		return nil, err
+		// Response is not table-friendly; fall back to indented JSON.
+		b, jsonErr := json.MarshalIndent(jsonSafe, "", "  ")
+		if jsonErr != nil {
+			return nil, err // return original table error
+		}
+		return append(b, '\n'), nil
 	}
 	return renderTable(rows)
 }

main_test.go

@@ -1013,3 +1013,41 @@ func TestTableOverheadFormula(t *testing.T) {
 		}
 	}
 }
+
+func TestTableMarshalFallsBackToJSON(t *testing.T) {
+	ct := dciTableContentType{}
+
+	tests := []struct {
+		name  string
+		input interface{}
+	}{
+		{"plain string", "How are you?"},
+		{"number", 42},
+		{"bool", true},
+		{"array of strings", []interface{}{"hello", "world"}},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			out, err := ct.Marshal(tc.input)
+			if err != nil {
+				t.Fatalf("expected JSON fallback, got error: %v", err)
+			}
+			if len(out) == 0 {
+				t.Fatal("expected non-empty output")
+			}
+		})
+	}
+}
+
+func TestTableMarshalObjectStillWorks(t *testing.T) {
+	ct := dciTableContentType{}
+	input := map[string]interface{}{"name": "test", "value": 123}
+	out, err := ct.Marshal(input)
+	if err != nil {
+		t.Fatalf("expected table output, got error: %v", err)
+	}
+	if len(out) == 0 {
+		t.Fatal("expected non-empty output")
+	}
+}