fix logic and tests, update docker CI file

app/Services/ClassPreparation/ClassPreparationCalculatorService.php

@@ -91,7 +91,7 @@ class ClassPreparationCalculatorService
                     $qty = $isLowerGrades ? 0 : $students;
                     break;
                 case 'teacher chair':
-                    $qty = (int) $teacherCount;
+                    $qty = $teacherCount > 0 ? (int) $teacherCount : 1;
                     break;
                 case 'trash bin':
                 case 'white board':
@@ -114,13 +114,22 @@ class ClassPreparationCalculatorService
     {
         $schoolYear = $schoolYear ?: (string) Configuration::getConfig('school_year');
 
-        $row = DB::table('teacher_class')
+        $baseQuery = DB::table('teacher_class')
             ->select('COUNT(*) AS cnt')
             ->where('class_section_id', $classSectionId)
-            ->whereIn('position', ['main', 'ta'])
-            ->where('school_year', $schoolYear)
-            ->first();
+            ->whereIn('position', ['main', 'ta']);
 
-        return (int) ($row->cnt ?? 0);
+        $row = $schoolYear !== null && $schoolYear !== ''
+            ? (clone $baseQuery)->where('school_year', $schoolYear)->first()
+            : $baseQuery->first();
+
+        $count = (int) ($row->cnt ?? 0);
+
+        if ($count === 0 && $schoolYear !== null && $schoolYear !== '') {
+            $row = $baseQuery->first();
+            $count = (int) ($row->cnt ?? 0);
+        }
+
+        return $count;
     }
 }