cleanup

build.py

@@ -23,8 +23,13 @@ if __name__ == '__main__':
     except OSError:
         pass
 
-    with open(src_md, 'rb') as labin, open('src/'+sys.argv[1]+'.json', 'rb') as datin:
-        data = json.load(datin)
+    with open(src_md, 'rb') as labin:
+        if os.path.exists('src/'+sys.argv[1]+'.json'):
+            with open('src/' + sys.argv[1] + '.json', 'rb') as datin:
+                data = json.load(datin)
+        else:
+            data = [{}]
+
         lab = labin.read().decode('utf8')
 
     for ex_no, d in enumerate(data, start=1):

src/lab2.json

-[
-  {}
-]
\ No newline at end of file

src/lab3.json

-[
-  {}
-]
\ No newline at end of file

src/lab6.json

-[
-  {
-
-  }
-]
\ No newline at end of file