Do not source plugins that are not downloaded

Fixes #3

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ### master
+- if the plugin is not downloaded do not source it
 
 ### v1.0.0, 2014-08-05
 - update readme because of github organization change to

scripts/source_plugins.sh

@@ -4,16 +4,22 @@ CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 source "$CURRENT_DIR/shared_functions.sh"
 
+plugin_dir_exists() {
+	[ -d "$1" ]
+}
+
 # Runs all *.tmux files from the plugin directory.
 # Files are ran as executables.
 # No errors if the plugin dir does not exist.
 silently_source_all_tmux_files() {
 	local plugin_path=$1
 	local plugin_tmux_files="$plugin_path*.tmux"
+	if plugin_dir_exists "$plugin_path"; then
 		for tmux_file in $plugin_tmux_files; do
 			# runs *.tmux file as an executable
 			$tmux_file >/dev/null 2>&1
 		done
+	fi
 }
 
 source_plugin() {