qiskit/releasenotes/notes/1.0/fix-missing-pulse-lib-c370f...

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---
fixes:
- |
Fixed an error when a user tries to load calibration
data of a gate from a :class:`.Target` in a particular situation.
This occurs when the backend reports only partial calibration data, for
example referencing a waveform pulse in a command definition but not
including that waveform pulse in the pulse library. In this situation, the
Qiskit pulse object could not be built, resulting in a failure to build the pulse
schedule for the calibration. Now when calibration data is incomplete
the :class:`.Target` treats it as equivalent to no calibration being reported
at all and does not raise an exception.