chore(structure): add error message if ctm territories definition not found

src/categories/services/categories.service.ts

 import { HttpService } from '@nestjs/axios';
-import { Injectable, Logger } from '@nestjs/common';
+import { HttpException, HttpStatus, Injectable, Logger } from '@nestjs/common';
 import { InjectModel } from '@nestjs/mongoose';
 import { Model } from 'mongoose';
 import { lastValueFrom } from 'rxjs';
@@ -27,6 +27,13 @@ export class CategoriesService {
 
   public async findCtmByInseeCode(inseeCode: string): Promise<Module> {
     const ctm = await this.findOneComplete('ctm');
+    if (!ctm) {
+      this.logger.error(`CTM territories definition not found. For local dev, run init-ctm-territories.js script.`);
+      throw new HttpException(
+        `CTM territories definition not found in database. For local dev, run init-ctm-territories.js script.`,
+        HttpStatus.INTERNAL_SERVER_ERROR
+      );
+    }
     return ctm.modules.find((ctm) => ctm.communes.includes(inseeCode));
   }