Malformed ctags file causes plugin to fail and resulting error message is misleading

[shalomb]

A malformed ~/.ctags file causes easytags not to load and the warning is then misleading.

I had made a mistake in generating my ~/.ctags file

$ head -n 1 ~/.ctags
- q-links=yes

Which sure is an error to ctags

$ ctags -f - --sort=no --excmd=number >/dev/null
ctags: Unknown option: -

However, easyplugin's error message suggests ctags is not installed/available - leading the user down a wild goose chase.

easytags.vim 3.11: Plug-in not loaded because Exuberant Ctags isn't installed! On Ubuntu & Debian you can install Exuberant Ctags by installing the package named `exuberant-ctags': sudo apt-get install exuberant-ctags
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