If the properties file is missed it can use default values; fix NPE that Properties throws

Author: vitalijr2

.mvn/wrapper/maven-wrapper.properties

@@ -14,5 +14,5 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.6/apache-maven-3.8.6-bin.zip
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
 wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar

src/main/java/uk/bot_by/aws_lambda/slf4j/LambdaLoggerFactory.java

@@ -278,7 +278,7 @@ private Properties loadProperties(String configurationFile) {
     try (InputStream configurationInputStream = Thread.currentThread().getContextClassLoader()
         .getResourceAsStream(configurationFile)) {
       properties.load(configurationInputStream);
-    } catch (IOException e) {
+    } catch (IOException | NullPointerException e) {
       // ignored
     }
 

src/test/java/uk/bot_by/aws_lambda/slf4j/PropertiesTest.java

@@ -305,4 +305,28 @@ void useLoggerProperties() {
         "properties-request-id \\d{2}:\\d{2}:\\d{2}\\.\\d{3} \\[main\\] thread=1 \\[DEBUG\\] test - debug message[\\n\\r]+"));
   }
 
+  @DisplayName("Try to read missed logger properties file, use default values")
+  @Test
+  void missedProperties() {
+    // given
+    var loggerFactory = spy(new LambdaLoggerFactory("missed.properties"));
+
+    doReturn(printStream).when(loggerFactory).getPrintStream();
+
+    MDC.put("request#", "properties-request-id");
+
+    // when
+    var logger = loggerFactory.getLogger("lambda.logger.test");
+
+    logger.debug("debug message");
+    logger.info("info message");
+
+    // then
+    printStream.flush();
+    printStream.close();
+    outputStream.toString(StandardCharsets.UTF_8);
+    assertThat(outputStream.toString(StandardCharsets.UTF_8), matchesPattern(
+        "INFO lambda.logger.test - info message[\\n\\r]+"));
+  }
+
 }