Fix generation of maxDensity field value in metadata files

Author: firefoxic

CHANGELOG.md

@@ -7,6 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and 
 
 ## [Unreleased]
 
+- The `maxDensity` field in metadata files when `-max-density 1` is specified now gets the correct value instead of the erroneous `null`.
+
 ## [3.0.0] — 2024–12–15
 
 ### Changed

lib/processRaster.js

@@ -108,7 +108,7 @@ export async function processRaster (options) {
 		let isMetaFileExists = await fileExists(metaJsonPath)
 		let metaData = isMetaFileExists ? await readJsonFile(metaJsonPath) : {}
 
-		metaData.maxDensity = Math.max(metaData.maxDensity, originDensity)
+		metaData.maxDensity = metaData.maxDensity ? Math.max(metaData.maxDensity, originDensity) : originDensity
 		metaData.formats = Array.from(new Set([...metaData.formats || [], ...formats]))
 		metaData.sizes = Array.from(new Set([...metaData.sizes || [], ...sizes].sort((a, b) => {
 			if (!a.breakpoint) return 1