Created SC1048 (markdown)

SC1048.md

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+## Can't have empty then clauses (use 'true' as a no-op).
+
+### Problematic code:
+
+```sh
+if [ -e foo ]
+then
+  # TODO: handle this
+fi
+```
+
+### Correct code:
+
+```sh
+if [ -e foo ]
+then
+  # TODO: handle this
+  true
+fi
+```
+### Rationale:
+
+Shells do not allow empty `then` clauses. They need at least one command (and comments are not commands).
+
+If you want a `then` clause that does nothing, use a dummy command like `true`.
+
+### Exceptions:
+
+None.