fix(mapping): add fallback for null formatId in tuple format injection

Add fallback logic to injectFormatIntoTuples, getTuplesWithInjectedFormat,
and getBatchTuplesWithInjectedFormat methods. When formatId is null and
only one format is available, use that format instead of null.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ArtDu

tarantool-jackson-mapping/src/main/java/io/tarantool/mapping/TarantoolJacksonMappingWithTargetClass.java

@@ -49,6 +49,9 @@ public static <T> Tuple<T> getTupleWithInjectedFormat(TarantoolResponse<List<Tup
         }
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
         return tuple;
       }
@@ -93,6 +96,9 @@ private static <T> SelectResponse<List<Tuple<T>>> injectFormatIntoTuples(
       for (Tuple<?> tuple : resp.get()) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }
@@ -139,6 +145,9 @@ private static <T> CrudBatchResponse<List<Tuple<T>>> getBatchTuplesWithInjectedF
       for (Tuple<?> tuple : tuples) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }
@@ -153,6 +162,9 @@ private static <T> List<Tuple<T>> getTuplesWithInjectedFormat(
       for (Tuple<?> tuple : tuples) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }

tarantool-jackson-mapping/src/main/java/io/tarantool/mapping/TarantoolJacksonMappingWithoutTargetType.java

@@ -104,6 +104,9 @@ private static SelectResponse<List<Tuple<List<?>>>> injectFormatIntoTuples(
       for (Tuple<?> tuple : resp.get()) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }
@@ -187,6 +190,9 @@ private static List<Tuple<List<?>>> getTuplesWithInjectedFormat(
       for (Tuple<?> tuple : tuples) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }
@@ -216,6 +222,9 @@ private static CrudBatchResponse<List<Tuple<List<?>>>> getBatchTuplesWithInjecte
       for (Tuple<?> tuple : tuples) {
         Integer formatId = tuple.getFormatId();
         List<Field> format = formats.get(formatId);
+        if (formatId == null && formats.size() == 1) {
+          format = formats.values().stream().findFirst().get();
+        }
         tuple.setFormat(format);
       }
     }