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docs: extend: plugins_volume.md: Err default to empty string

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

Antonio Murdaca authored on 2015/12/16 17:52:26
Showing 1 changed files
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@@ -65,7 +65,7 @@ Opts is a map of driver specific options passed through from the user request.
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 **Response**:
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 ```
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 {
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-    "Err": null
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+    "Err": ""
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 }
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 ```
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@@ -85,7 +85,7 @@ Delete the specified volume from disk. This request is issued when a user invoke
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 **Response**:
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 ```
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 {
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-    "Err": null
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+    "Err": ""
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 }
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 ```
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@@ -109,7 +109,7 @@ at the first mount request and deprovision at the last corresponding unmount req
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 ```
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 {
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     "Mountpoint": "/path/to/directory/on/host",
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-    "Err": null
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+    "Err": ""
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 }
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 ```
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@@ -131,7 +131,7 @@ Docker needs reminding of the path to the volume on the host.
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 ```
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 {
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     "Mountpoint": "/path/to/directory/on/host",
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-    "Err": null
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+    "Err": ""
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 }
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 ```
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@@ -154,7 +154,7 @@ this point.
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 **Response**:
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 ```
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 {
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-    "Err": null
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+    "Err": ""
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 }
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 ```
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