[common/tasks_problems] Fixing empty input leading to code block star…

…ting at 0

inginious/common/tasks_problems.py

@@ -182,14 +182,17 @@ def input_is_consistent(self, task_input, default_allowed_extension, default_max
  @classmethod
  def parse_problem(self, problem_content):
  # Checking problem edit inputs
- if len(problem_content["offset"]) != 0:
+ if len(problem_content["offset"]) == 0:
+ problem_content["offset"] = 1 
+ else:
  try:
  offset = int(problem_content["offset"])
  if offset < 1:
  raise Exception("Line offset must be positive!")
  problem_content["offset"] = offset
  except ValueError:
  raise Exception("Line offset must be an integer!")
+
  return Problem.parse_problem(problem_content)
 
  @classmethod