Avoid NPE catch in SH mode fallback parsing

Agent-Logs-Url: https://github.com/jMonkeyEngine/jmonkeyengine/sessions/e70ed475-af44-4c2b-9f29-f76d9a0422b8

Co-authored-by: riccardobl <4943530+riccardobl@users.noreply.github.com>

Author: Copilot

jme3-core/src/main/java/com/jme3/environment/EnvironmentProbeControl.java

@@ -372,9 +372,12 @@ public Spatial getSpatial() {
     }
 
     static IBLGLEnvBakerLight.SphericalHarmonicsMode readSphericalHarmonicsMode(String modeName) {
+        if (modeName == null) {
+            return IBLGLEnvBakerLight.SphericalHarmonicsMode.FAST;
+        }
         try {
             return IBLGLEnvBakerLight.SphericalHarmonicsMode.valueOf(modeName);
-        } catch (IllegalArgumentException | NullPointerException ex) {
+        } catch (IllegalArgumentException ex) {
             // Legacy AUTO and unknown values now fall back to FAST.
             return IBLGLEnvBakerLight.SphericalHarmonicsMode.FAST;
         }

jme3-core/src/test/java/com/jme3/environment/EnvironmentProbeControlTest.java

@@ -63,4 +63,10 @@ public void keepsQualitySphericalHarmonicsModeWhenReading() {
                 EnvironmentProbeControl.readSphericalHarmonicsMode(
                         IBLGLEnvBakerLight.SphericalHarmonicsMode.QUALITY.name()));
     }
+
+    @Test
+    public void readsNullSphericalHarmonicsModeAsFast() {
+        assertEquals(IBLGLEnvBakerLight.SphericalHarmonicsMode.FAST,
+                EnvironmentProbeControl.readSphericalHarmonicsMode(null));
+    }
 }