FIX: assets: division by zero when trying to calculate depreciation o…

…n assets that don't have it (#31858)

* FIX: assets: division by zero when trying to calculate depreciation on assets that don't have it

* FIX: assets: division by zero when trying to calculate depreciation on assets that don't have it, part 2

htdocs/asset/class/asset.class.php

@@ -814,6 +814,10 @@ public function calculationDepreciation()
 			return -1;
 		}
 
+		if (! empty($this->not_depreciated)) {
+			return 1;
+		}
+
 		// Get depreciation options
 		//---------------------------
 		require_once DOL_DOCUMENT_ROOT . '/asset/class/assetdepreciationoptions.class.php';