Fix newline bug in mg_import_csv

Summary:
Handle special case when delimiter is the last character in line.
This means that another empty column needs to be added.

Reviewers: teon.banek

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D1678

tools/src/mg_import_csv/main.cpp

@@ -188,6 +188,12 @@ std::vector<std::string> ReadRow(std::istream &stream) {
       } else if (c == FLAGS_csv_delimiter.front()) {
         row.emplace_back(column.begin(), column.end());
         column.clear();
+        // Handle special case when delimiter is the last
+        // character in line. This means that another
+        // empty column needs to be added.
+        if (i == line_size - 1) {
+          row.emplace_back("");
+        }
       } else {
         column.push_back(c);
       }

tools/tests/csv/forum_nodes.csv

@@ -1,6 +1,6 @@
-id:ID(FORUM_ID)|title:string|:LABEL
-0|General|Forum
-1|Support|Forum
-2|Music|Forum
-3|Film|Forum
-4|Programming|Forum
+id:ID(FORUM_ID)|title:string|:LABEL|emptyColumn
+0|General|Forum|
+1|Support|Forum|
+2|Music|Forum|
+3|Film|Forum|
+4|Programming|Forum|