Log prohibited unit skips and prevent invalid part additions

Added a log message to improve traceability when skipping prohibited units. Also ensured parts not in the existing parts list are excluded to prevent accidental additions to the pool. These changes enhance debugging and maintain data integrity.

MekHQ/src/mekhq/campaign/mission/resupplyAndCaches/Resupply.java

@@ -537,6 +537,7 @@ private Map<String, PartDetails> collectParts() {
                 }
 
                 if (isProhibitedUnitType(entity, false)) {
+                    logger.info("skipping " + unit.getName() + " as it is prohibited.");
                     continue;
                 }
 
@@ -711,8 +712,12 @@ private void applyWarehouseWeightModifiers(Map<String, PartDetails> partsList) {
                 continue;
             }
 
-            PartDetails partDetails = new PartDetails(part, weight);
+            // This prevents us accidentally adding new items to the pool
+            if (!partsList.containsKey(getPartKey(part))) {
+                continue;
+            }
 
+            PartDetails partDetails = new PartDetails(part, weight);
             partsList.merge(getPartKey(part), partDetails, (oldValue, newValue) -> {
                 oldValue.setWeight(oldValue.getWeight() - newValue.getWeight());
                 return oldValue;