Поправил ошибку с пустым проектом Ветро

Reviewed-on: #6

config/RedmineTracker.sql

@@ -9,7 +9,7 @@ CREATE TABLE IF NOT EXISTS "activity" (
 	"vetro_project_id" VARCHAR,
 	"tag_id" VARCHAR NOT NULL,
 	"task_id" INTEGER,
-	"project_id" VARCHAR NOT NULL,
+	"project_id" VARCHAR,
 	PRIMARY KEY("id"),
 	FOREIGN KEY ("author_id") REFERENCES "user"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION,
@@ -49,16 +49,18 @@ CREATE TABLE IF NOT EXISTS "task" (
 
 CREATE TABLE IF NOT EXISTS "time_entry" (
 	"id" INTEGER,
-	"author_id" INTEGER NOT NULL,
 	"description" VARCHAR NOT NULL,
 	"date" DATETIME NOT NULL,
 	"activity_id" VARCHAR NOT NULL,
 	"time_spent" NUMERIC NOT NULL,
 	"task_id" INTEGER NOT NULL,
 	"activity_type_id" INTEGER NOT NULL,
+	"author_id" INTEGER NOT NULL,
 	PRIMARY KEY("id"),
 	FOREIGN KEY ("author_id") REFERENCES "user"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION,
+	FOREIGN KEY ("activity_id") REFERENCES "activity"("id")
+	ON UPDATE NO ACTION ON DELETE NO ACTION,
 	FOREIGN KEY ("task_id") REFERENCES "task"("id")
 	ON UPDATE NO ACTION ON DELETE NO ACTION,
 	FOREIGN KEY ("activity_type_id") REFERENCES "activity_type"("id")

db/db.py

@@ -122,6 +122,8 @@ class Database:
     
     def insert_vetro_projects(self, vetro_projects: list[VetroProject]):
         """Сохраняет в базу данных Проекты (ДО) Ветро Clockify"""
+        if not vetro_projects:
+            return
         for vetro_project in vetro_projects:
             try:
                 self.cursor.execute("INSERT INTO vetro_project VALUES(?, ?)", (vetro_project.id, vetro_project.title))