Add exception handling

Author: dai0304

spar-wings-thymeleaf-s3/src/main/java/jp/xet/sparwings/thymeleaf/s3/S3TemplateResourceResolver.java

@@ -59,7 +59,9 @@ public InputStream getResourceAsStream(TemplateProcessingParameters templateProc
 			} else {
 				log.warn(e.getMessage());
 			}
-			return null;
+		} catch (Exception e) { // NOPMD
+			log.warn("Unexpected", e);
 		}
+		return null;
 	}
 }