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How to check if a variable exists in a FreeMarker template?

I have a Freemarker template which contains a bunch of placeholders for which values are supplied when the template is processed. I want to conditionally include part of the template if the userName variable is supplied, something like: ...
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How can I move a single directory from a git repository to a new repository whilst maintaining the h

I have inherited a git repository containing multiple projects in separate directories. I'd like to split the repository into new individual repositories, one for each project and then have the master repository contain the projects as submodules. I'd like to do all this whilst maintaining the revis...
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Should I use the Reply-To header when sending emails as a service to others?

Suppose we have an application that acts as a middleman, allowing Company A to send reports to their customers. 3 Answers ...
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Assign multiple columns using := in data.table, by group

What is the best way to assign to multiple columns using data.table ? For example: 2 Answers ...
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Create Directory if it doesn't exist with Ruby

I am trying to create a directory with the following code: 4 Answers 4 ...
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“icon-bar” in twitter bootstrap navigation bar

I cannot understand what the following code means in terms of icon-bar : 3 Answers 3 ...
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What is the difference between object keys with quotes and without quotes?

... No, the quotes do not make a difference (unless, as you noted, you want to use a key that’s not a valid JavaScript identifier). As a side note, the JSON data exchange format does require double quotes around identifiers (and does not allow sing...
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getSupportActionBar from inside of Fragment ActionBarCompat

I'm starting a new project that uses the AppCompat/ActionBarCompat in v7 support library. I'm trying to figure out how to use the getSupportActionBar from within a fragment. My activity that hosts the fragment extends ActionBarActivity , but I don't see a similar support class for Fragments. ...
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Mockito: Inject real objects into private @Autowired fields

I'm using Mockito's @Mock and @InjectMocks annotations to inject dependencies into private fields which are annotated with Spring's @Autowired : ...
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How to delete a word and go into insert mode in Vim?

In normal mode I can hit Ctrl + E which deletes the rest of the current word and goes to insert mode. 5 Answers ...