Strip only "\n" in TSV lines

dbnomics_data_model/observations.py

@@ -323,7 +323,9 @@ def iter_tsv_rows(tsv_io):
     >>> test("")
     []
     >>> test("     ")
-    []
+    [['     ']]
+    >>> test("period\tvalue")
+    [['period', 'value']]
     >>> test("period\tvalue\n")
     [['period', 'value']]
     >>> test("period\tvalue\n2018\t0.2")
@@ -332,9 +334,11 @@ def iter_tsv_rows(tsv_io):
     [['period', 'value'], ['2018', '0.2']]
     >>> test("period\tvalue\tattribute1\n2018\t0.2\tZ\n")
     [['period', 'value', 'attribute1'], ['2018', '0.2', 'Z']]
+    >>> test("period\tvalue\tstatus\n\n2017\t0.1\t\n2018\t0.2\tE")
+    [['period', 'value', 'status'], ['2017', '0.1', ''], ['2018', '0.2', 'E']]
     """
     for line in tsv_io:
-        line = line.strip()
+        line = line.strip('\n')
         if not line:
             continue
         cells = line.split("\t")