[Bug]: getVectorLayers: unsafe JSON handling in vector source loader

[Athina09]

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Bug Description

Summary

getVectorLayers can throw when a WFS request fails because readFeatures is called with null/invalid JSON.

Problem

In src/actions/getVectorLayers.js, the vector source uses a custom loader that fetches the WFS URL. When the response is not OK, the code returns null from the first .then, but the next .then still runs and calls:

vectorSource.getFormat().readFeatures(json)

If json is null (or otherwise invalid), this can throw and break layer loading, instead of failing gracefully.

Expected behavior

• If the HTTP request fails or returns a non-OK status, the loader should not attempt to parse features.
• The layer should fail quietly (log a warning) without throwing.

Suggested fix

Add a guard before parsing:

.then((json) => {
  if (!json) return;
  vectorSource.addFeatures(vectorSource.getFormat().readFeatures(json));
})

### Steps to Reproduce

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### Expected Behavior

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